I doubt the topic of the abortion was the only reason for this, I assume its one of many and that he can only think of this.
Being that his wife looked disappointed, It might be that she is sad that he is going on about this one topic again as if it's the cause of everything. While he has probably committed many more horrid acts but can only think of this one instant.
It's a bit like a drunk that has always been a horrid person blaming the one time they missed a goal in football as a kid for why their entire life is crappy. There is defiantly more to this, although I was surprised that the boy is glasses lady's son. (WHAT A TWIST!)
Thank you everyone over at
Senko-san's Abode for another amazing translation.