Some parents, some male parents, cripple their income in order not to pay child support.
Good for them if they live in a place where they can get away with it!
Of course I would argue there's probably much more to the story than you reveal if those men are willing to cut off their nose to spite their face in such a way, but it does reveal what you consider the salient issue. "Child support" sounds rather innocuous when one is actually talking about "chilamony," custody dispute, etc.
Furthermore, some custodial mothers pimp out their children as sexual slaves. Others allow their children to be molested by their live-in boyfriends. Does that change your opinion of female rectitude?