Life for our great-great-grandparents sucked much worse on absolute measures than for us. They didn't say "this sucks, let's die" and they also needed children to support them. Wealthier societies with a social safety net downplay the need for children in the family.

I do understand that the future physical world looks worse than the present one. But hey the survivors are the ones who rule. You can make the choice to take a weakness mindset out of the gene pool and that's fine, there are too many people already.