I guess it's because society
expects the mother to be nurturing and not so much the dad.
So when people see him sticking around without a partner, it looks sweet and people want to assist, but for a woman, again since that much is expected of her, most focus on why she couldn't keep a man around. Perhaps she ran him off? Perhaps she slept with some loser and should have known better?
That's how people seem to always judge the situation.
Me, I try not to give people too many points for doing something they SHOULD be doing, like rearing their own children, men or women. But I do understand how certain things come more naturally for a woman caring for a child than a man, and why one might feel more sympathetic toward him having to go it alone.
