There is no consideration of need just ability to pay. Fathers are not just seen as sperm donors but as ATMs. We operate under the illusion that the money is all for kids but there is zero requirement to spend it on the kids. We have a hierarchy of who needs to be protected by the law and who doesn't and that hierarchy is driven by the soft minded liberals who have taken over our university system. If you start with the idea that men and especially white men are the root of all evil it is hardly surprising that law schools puke a group of people who seldom side with white men, unless of course they are being paid to. We pass laws in this country that encourages companies to pay women more do the same jobs but punishes you if you can prove that a man being paid more actually deserves it. Really not that much different that three white men beating a black man is a hate crime while three black men beating a white man is a sing of how society has failed the black community. It all comes from the same idea that some groups should be made "extra" equal to balance things out.
Sorry but I don't by the whole "societal roles" crap. That may part of the problem but the idea that woman can decide she would rather be sleepy with some other guy who pays more attention to her so can just take the kids and the courts will force the poor son of bitch who married to give her thirty percent of his pay for the next 15 years is a new idea and does not come from outdated social norms but misguided attempts to conduct social engineering. 50 years ago if your wife was a drug addict who slept all day while your kids lived in filth you could take the kids and leave her but now she goes into rehab, which have to pay for, and gets the kids to move with the meth head she met in rehab. Feminism was not an innocent bystander but a primary driver in that change. Mothers and their right should be protected at all cost (including the children) in the name of the children. They are a lot like teacher's unions in that regard.
Sorry if I ranted on you rant.