As usual, it looks like we're going to have to debate something which makes perfect sense to most others on the planet.

I never said that a species has to hit crisis level. I said that there are factors which naturally limit a population's size. There doesn't necessarily have to be a crisis before this happens. In many species, for example, the males leave the group in which they grew up when they reach maturity, and find a territory of their own. Sometimes he may have to fight for one, if there are lots of other males doing the same. I could come up with 100 other examples.

Can you give one of your own please?