Two lying responses to World Overpopulation

The most extreme response to world human overpopulation is Terrorism.

Basically, in terrorism one is saying: "I'm going to lie to myself so I can kill almost everyone and feel okay or good about it."

Then you have the diametrically opposite response:

Political Correctness:

Which is saying: "I'm going to lie both to you and to myself so I don't have to kill you."

Which is a better response to human overpopulation worldwide?

I think in some ways when you have human overpopulation you are going to have aberrant responses like this.

In the first response human civilization is going to end and humans will revert to being animals once again.

But, in the second response another type of aberrant insanity ensues and eventually civilization becomes dysfunctional and ends.

Neither response saves humanity from extinction through thinking either way eventually.

So, what is the response that might prevent human extinction because it is neither one of these responses?