>For example, overpopulation has been a concern for many decades, yet politicians that ignore the problem, or actually advocate for more population, somehow keep getting elected.

Are you from the 1800s? Malthusianism has been discredited for decades, thanks to the green revolution and falling fertility rates. Not to mention all politicians that tried to do something (ie. didn't "ignore the problem") have a sorry track record - eugenics, one child policy, or forced sterilizations.

I don't believe they are talking about malthusianism. That's a straw man. The arguement is that the sheer number of people is causing damage to the natural environment, not that we can't grow enough food to feed people.