Well, if I won’t support them, I’m confident our welfare system will! :-)
I don't know if anyone has made THIS observation yet regarding your contention that the legal system should hold the "pseudo-dad" responsible BUT, while the legal system COULD make such an assertion, and even though you said several times that the adult should "take the hit" and NOT the child, there is absolutely NOTHING the legal system can do to force a man to behave in a loving way toward a child that he resents.