Comparisons, when odious

Once more, Mr. Max Müller deprecates the making of comparisons between savage and Vedic myths (i. 210), and then (i. 220) he deprecates the acceptance of these very comparisons ‘as really authoritative until fully demonstrated.’ Now, how is the validity of the comparisons to be ‘fully demonstrated’ if we are forbidden to make them at all, because to do so is to ‘obscure’ the Veda ‘by light from the Dark Continent’?