Living organisms had existed on earth, without ever knowing why, for over three thousand million years before the truth finally dawned on one of them… - Richard Dawkins

Wild animals almost never die of old age: starvation, disease, or predators catch up with them long before they become really senile. Until recently this was true of man too. Most animals die in childhood, many never get beyond the egg stage. Starvation and other causes of death are the ultimate reasons why populations cannot increase indefinitely.

On natural selection: "Any entity capable of intelligently designing something as improbable as Dutchman's Pipe (or a universe) would have to be even more improbable than a Dutchman's Pipe. Far from terminating the vicious regress, God aggravates it with a vengeance." (p. 146)

I am not advocating a morality based on evolution. I am saying how things have evolved. I am not saying how we humans morally ought to behave.