Quote:
Originally posted by John Henry
War is a good way of bringing a population down to a sustainable level, before it completely runs out of resources and everyone dies. It also makes sure that the resources then go to the individuals most likely to survive and therefore benefit from them. Nasty, but a good way of not going extinct. The same probably goes for a number of other 'side-effects'
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War is not needed for population control.
The population level of a species is self regulating, and will evolve in such a way so as to maintain itself.
A shortage of food/resources, will increase the selection pressure, and thus lower the population.
A population will never grow so large that the environment can't sustain it, and thus cause it to become extinct (except in rare circumstances, and in those cases war isn't going to help anyway).