A. Because it serves their need and expresses their inner feelings.
Q. Why are they willing to choose such an uncomfortable mode of expression?
A. Because they don't know what they are doing, and the subconscious is very insistent.
WHO?
Q. Who gets up tired every morning?
A. The neurotic.
Q. Who fancies his brain so exhausted that a little concentration is impossible?
A. The neurotic.
Q. Who still believes himself exhausted as the result of work that is now ancient history?
A. The neurotic.