Some people want to make the world a better place by having families. To me this makes at least as much sense most plans for world-improvement.

What about having families makes the world a better place?

Plenty of abusive, criminal, ..., families. Matter of fact, every negative historical figure was also born into a family.

"What about having families makes the world a better place?"

Families are vital. That everybody from Genghis Kahn to Jonas Salk was born into one ought to be the tip-off.