Causality is a relationship (mostly between two things, or, rather, events, the cause and the effect). Something generates or produces another. Therefore, it is the other's efficient cause and it acts upon it (=it acts to bring it about) through the mechanism of efficient causation. A cause can be a direct physical mechanism or an explanatory feature (historical cause). Of Aristotle's Four Causes (Formal, Material, Efficient and Final), only the efficient cause creates something distinguishable from itself. The causal discourse, therefore, is problematic (how can a cause lead to an effect, indistinguishable from itself?). Singular Paradigmatic Causal Statements (Event A caused Event B) differ from General ones (Event A causes Event B). Both are inadequate in dealing with mundane, routine, causal statements because they do not reveal an OVERT relation between the two events discussed. Moreover, in daily usage we treat facts (as well as events) as causes. Not all the philosophers are in agreement regarding factual causation. Davidson, for instance, admits that facts can be RELEVANT to causal explanations but refuses to accept them AS reasons. Acts may be distinct from facts, philosophically, but not in day-to-day regular usage. By laymen (the vast majority of humanity, that is), though, they are perceived to be the same.
Pairs of events that are each other's cause and effect are accorded a special status. But, that one follows the other (even if invariably) is insufficient grounds to endow them with this status. This is the famous "Post hoc, ergo propter hoc" fallacy. Other relations must be weighed and the possibility of common causation must be seriously contemplated. Such sequencing is, conceptually, not even necessary: simultaneous causation and backwards causation are part of modern physics, for instance.
Time seems to be irrelevant to the status of events, though both time and causation share an asymmetric structure (A causes B but B does not cause A). The direction (the asymmetry) of the causal chain is not of the same type as the direction (asymmetry) of time. The former is formal, the latter, presumably, physical, or mental. A more serious problem, to my mind, is the converse: what sets apart causal (cause and effect) pairs of events from other pairs in which both member-events are the outcomes of a common cause? Event B can invariably follow Event A and still not be its effect. Both events could have been caused by a common cause. A cause either necessitates the effect, or is a sufficient condition for its occurrence. The sequence is either inevitable, or possible. The meaninglessness of this sentence is evident.
Here, philosophers diverge. Some say (following Hume's reasoning and his constant conjunction relation between events) that a necessary causal relation exists between events when one is the inevitable outcome (=follows) the other. Others propound a weaker version: the necessity of the effect is hypothetical or conditional, given the laws of nature. Put differently: to say that A necessitates (=causes) B is no more than to say that it is a result of the laws of nature that when A happens, so does B. Hempel generalized this approach. He said that a statement of a fact (whether a private or a general fact) is explained only if deduced from other statements, at least one of which is a statement of a general scientific law.
This is the "Covering Law Model" and it implies a symmetry between explaining and predicting (at least where private facts are concerned). If an event can be explained, it could have been predicted and vice versa. Needless to say that Hempel's approach did not get us nearer to solving the problems of causal priority and of indeterministic causation.
The Empiricists went a step further. They stipulated that the laws of nature are contingencies and not necessary truths. Other chains of events are possible where the laws of nature are different. This is the same tired regularity theory in a more exotic guise. They are all descendants of Hume's definition of causality: "An object followed by another and where all the objects that resemble the first are followed by objects that resemble the second." Nothing in the world is, therefore, a causal necessity, events are only constantly conjoined. Regularities in our experience condition us to form the idea of causal necessity and to deduce that causes must generate events. Kant called this latter deduction "A bastard of the imagination, impregnated by experience" with no legitimate application in the world. It also constituted a theological impediment. God is considered to be "Causa Sui", His own cause. But any application of a causal chain or force, already assumes the existence of a cause. This existence cannot, therefore, be the outcome of the use made of it. God had to be recast as the uncaused cause of the existence of all things contingent and His existence necessitated no cause because He, himself, is necessary. This is flimsy stuff and it gets even flimsier when the issue of causal deviance is debated.
A causal deviance is an abnormal, though causal, relation between events or states of the world. It mainly arises when we introduce intentional action and perception into the theory of causation. Let us revert to the much-maligned owner of the sinking Titanic. He intended to do one thing and another happened. Granted, if he intended to do something and his intention was the cause of his doing so - then we could have said that he intentionally committed an act. But what if he intended to do one thing and out came another? And what if he intended to do something, mistakenly did something else and, still, accidentally, achieved what he set out to do? The popular example is if someone intends to do something and gets so nervous that it happens even without an act being committed (intends to refuse an invitation by his boss, gets so nervous that he falls asleep and misses the party). Are these actions and intentions in their classical senses? There is room for doubt. Davidson narrows down the demands. To him, "thinking causes" (causally efficient propositional attitudes) are nothing but causal relations between events with the right application of mental predicates which ascribe propositional attitudes supervening the right application of physical predicates. This approach omits intention altogether, not to mention the ascription of desire and belief.
But shouldn't have the hapless owner availed his precious place to women and children? Should not he have obeyed the captain's orders (=the marine law)? Should we succumb to laws that put our lives at risk (fight in a war, sink with a ship)? The reason that women and children are preferred over men is that they represent the future. They are either capable of bringing life to the world (women) - or of living longer (children). Societal etiquette reflects the arithmetic of the species, in this (and in many another) case. But if this were entirely and exclusively so, then young girls and female infants would have been preferred over all the other groups of passengers. Old women would have been left with the men, to die. That the actual (and declared) selection processes differed from our theoretical exercise says a lot about the vigorousness and applicability of our theories - and a lot about the real world out there. The owner's behaviour may have been deplorable - but it, definitely, was natural. He put his interests (his survival) above the concerns of his society and his species. Most of us would have done the same under the same circumstances.
The owner of the ship - though "Newly Rich" - undoubtedly belonged to the First Class, Upper Crust, Cream of Society passengers. These were treated to the lifeboats before the passengers of the lower classes and decks. Was this a morally right decision? For sure, it was not politically correct, in today's terms. Class and money distinctions were formally abolished three decades ago in the enlightened West. Discrimination between human beings in now allowed only on the basis of merit (=on the basis of one's natural endowments). Why should we think one basis for discrimination preferable to another? Can we eliminate discrimination completely and if it were possible, would it have been desirable?
The answers, in my view, are that no basis of discrimination can hold the moral high ground. They are all morally problematic because they are deterministic and assign independent, objective, exogenous values to humans. On the other hand, we are not born equal, nor do we proceed to develop equally, or live under the same circumstances and conditions. It is impossible to equate the unequal. Discrimination is not imposed by humans on an otherwise egalitarian world. It is introduced by the world into human society. And the elimination of discrimination would constitute a grave error. The inequalities among humans and the ensuing conflicts are the fuel that feeds the engines of human development. Hopes, desires, aspirations and inspiration are all the derivatives of discrimination or of the wish to be favoured, or preferred over others. Disparities of money create markets, labour, property, planning, wealth and capital. Mental inequalities lead to innovation and theory. Knowledge differentials are at the heart of educational institutions, professionalism, government and so on. Osmotic and diffusive forces in human society are all the results of incongruences, disparities, differences, inequalities and the negative and positive emotions attached to them. The passengers of the first class were preferred because they paid more for their tickets. Inevitably, a tacit portion of the price went to amortize the costs of "class insurance": should anything bad happen to this boat, persons who paid a superior price will be entitled to receive a superior treatment. There is nothing morally wrong with this. Some people get to sit in the front rows of a theatre, or to travel in luxury, or to receive superior medical treatment (or any medical treatment) precisely because of this reason. There is no practical or philosophical difference between an expensive liver transplant and a place in a life boat. Both are lifesavers.