There are studies suggesting this is a major problem in Islamic countries.
Rich men take up multiple wives, dividing their attention between multiple families. It is nearly as bad for life outcomes as having a “single mother”, because you don’t have the father’s intense investment in one mother and children.
And then you get violence because many young men can’t find partners, whereas settling down with a wife tends to mature them and is correlated to reduced violence.
Rich men take up multiple mistresses and no one cares. They're actually CELEBRATED for it! And if they have kids with their mistresses even that's tacitly allowed - like with Arnold Schwarzensomething/
Men can have all sorts of meaningless affairs and have all sorts of kids with the women they play with and no one cares.
But let that man take responsibility for the muliple women he loves and THAT'S a problem.
To me the more conservative-libertarian argument is that if some man wants to take care of multiple women and multiple children instead of having them all on welfare then we should be okay with that. After all, as a society we're okay with the ethnic men who have myriad children with random women like we see on MTV.