I've noticed that those who study self-regulation nearly always include some phrase like "this species has evolved a means to avoid overpopulation".

Now there's pretty much only one way anyone can believe this: everything that exists evolved, so this mechanism evolved. But they don't seem to have given it any more thought.

Consider what's supposed to have evolved. Consider it carefully.

Once upon a time, the species has no regulation. Reproduction is full-throttle, all the time. One day, an individual emerges which by some means or another is equipped for self-regulation. When the population density rises, this individual stops reproducing. The rest keep going & going. They overpopulate, struggle, etc. Meanwhile, the self-regulating individual goes extinct. The trait is removed from the population.

I know evolutionists & their faith in luck. Some will say the SRI could get lucky & survive. So what? The cycle just repeats. Round 2: SRI & offspring will again stop reproducing, forfeiting the field to the competition. How many cycles can they survive? Rigid evodoctrine calls for extinction in the very first round, but even loosening up the Darwinism can't account for cycle after cycle.

The trait in question must exist from the very beginning. It cannot arise, compete, and survive in a population that does not possess it. It's very nature is to not compete, and not pass on to future generations.