The symbolism of meat-eating is never neutral. To himself, the meat-eater seems to be eating life. To the vegetarian, he seems to be eating death. Th… - Mary Midgley

Do we find ourselves a species naturally free from conflict? We do not. There has not, apparently, been in our evolution a kind of rationalization which might seem a possible solution to problems of conflict--namely, a takeover by some major motive, such as the desire for future pleasure, which would automatically rule out all competing desires. Instead, what has developed is our intelligence. And this in some ways makes matters worse, since it shows us many desirable things that we would not otherwise have thought of, as well as the quite sufficient number we knew about for a start. In compensation, however, it does help us to arbitrate. Rules and principles, standards and ideals emerge as part of a priority system by which we guide ourselves through the jungle. They never make the job easy--desires that we put low on our priority system do not merely vanish--but they make it possible. And it is in working out these concepts more fully, in trying to extend their usefulness, that moral philosophy begins. Were there no conflict, it [moral philosophy] could never have arisen.

The point cannot be just survival, nor even survival in numbers. Survival is just as well achieved by much less ambitions creatures which go in for sheer number. (In fact a cost-benefit-conscious gene that really understood its business would, no doubt, have remained on board something like the amoeba; it will probably be amoung the last to go.) Nor is it survival-as-society, since many animals achieve this despite a lot of bickering.

Philosophy, in spite of all its tiresome features, is not a luxury but a necessity, because we always have to use it when things get difficult.