Why does anyone care if someone else doesn't want kids? I mean, I have kids but I couldn't give a toss if others don't want to procreate. Its not like the species is at risk.
I've certainly been guilty of lashing out at someone with whatever I felt might cut deepest. being impotent to resolve your (technically unjustified) rage can lead a person down a dark path.
[] is perceived as implying, i guess
Its your responsibility to repay that debt by reproducing.
This is one of the strange explanations I usually get.