I have more than once tried to analyse this apparently deliberate form of self-torture that seems common to so many people in face of the extinction of a valued life, human or animal, and it springs, I think, from a negation of death, as if by summoning and arranging these subjective images one were in some way cheating the objective fact. It is, I believe, an entirely instinctive process, and the distress it brings with it is an incidental, a by-product, rather than a masochistic end.