Because the poorer or dumber the people are, the more they procreate. I personally don't understand people willingly having a child while they're both working all day and still aren't rich. Especially in the USA.

Wifey and me don't work, have more money than we ever need and still think a child is too expensive in money AND time.

The system is broken globally, everything sucks, climate is dying, prices skyrocket, population explodes...I think we did our future not-child a favour.