Comment by bluGill

Humanity survived - but a lot of individual died that wouldn't today. As a parent I don't want to see most of my children die before they reach 5. I've been to more funerals of children in my life than I want to. The vast majority of the children I've ever met will see their 65th birthday: because of vaccines and modern drugs.

My wife would also hate having to give birth a dozen times just to get enough children (that much unprotected sex is fine with me). I don't want my wife to die in childbirth which was fairly common before modern drugs as well.