Except the only reason Bruce is on the hook for child support is because Clarice is the custodial parent of the child. Why shouldn’t Bruce get custody of the child, and Clarice should have to pay child support? Clarice is obviously a kook, so it seems pretty likely that the best interest of the child is to live with Bruce.
Of course if Bruce doesn’t want to raise this child then he can leave the child with the kooky sperm-stealing mother and pay to support his child.
And to address something earlier, a woman cannot legally sign away her child’s right to child support. Yes, this means if you have sex with a woman who wants a child and she tells you that you can walk away free and clear, her statements are not legally enforceable. Child support belongs to a child, not the child’s custodial parent.
A custodial parent can certainly say, “I dunno who the father is.” If she doesn’t pursue a child support order, then yes you will not have to pay child support. But if she goes on welfare, lots of states will attempt to track down the father of the child and garnish his wages to defray the costs of welfare for his child. This isn’t always possible if the identity of the father really is only known to the mother, but often such things are not secret.
So if you get a woman pregnant you can be on the hook for child support, and back child support, even if she says you aren’t. She doesn’t have the right to make that choice for her child. But children can sue for back child support even after they turn 18. It happens, and it doesn’t matter what conversations the mother and father had back when the child was conceived.
Of course, another man might be assumed to be the legal father, and if he puts his name on the birth certificate as the father and assumes a paternal role for a certain amount of time with no paternity disputes, then he becomes the legal father regardless of who the genetic father is.
But what this means is that society has an interest in assigning paternity to children. This means that you can’t, 10 years later, claim that your child is really the child of your wife’s boyfriend, and you’re not responsible for the child. Yes you are, just as if you had adopted a child that was not genetically related to you. Once you become the legal parent of the child you can’t unilaterally disclaim responsibility for it.
Nobody asked me for a DNA sample when my kids were born to prove that I was the genetic father. I am their legal father regardless of their genetic parentage, and even if someone could prove that I am not their genetic father I would still be their legal father.