Well,people don't want to take responsabilities anymore. Better not having any kids if you know you're not up the task or if you hope that your life will stay the same. Still a lot of people have kids (many kids sometimes) and just don't think about the consequences 'til shit hits the fan.
The problem is that their instinct of survival will eventually kick in, it's biological and for most, unconscious; even if they have nothing or very few to offer, transmit to their kids, they will have em. This is how Nature works. Even johnny falcon the painter with no education at all , who spends his spare time lifting weights and smoking drugs at past 30 y/o while dreaming about teens, will have kids because he will figure out someday it's his only key to eternity, immortality.
Can you believe that.
Seriously if johnny ever has a daughter, I fear for her, the guy obviously has pedophile tendencies, women dont interest him, little teens or prebuscent girls do.
Stupid people also tend to breed even more than smarter people for some reasons. Looks like the ratio smart people/ stupid people will always be like 1 vs 9.
And we wonder why the societies have always been pyramidal....
Everything is cyclic, hydraulic, and systemic. Everything is process of survival.