I agree with you by the way. There is no doubt, as the person to whom you responded stated, that it is long-standing legal principle for the declared father at birth to be responsible for the child notwithstanding later contested paternity. However, now that we have DNA testing that can eliminate any doubt when a man did not sire the child, I think that the laws will change within 10-20 years so that establishing non-paternity will absolve men of child-support obligations.
This has been English law for 500 years. And I have had no problem with that. It had a certain crude logic that preserved families. But today we have DNA testing and women who work outside the home, who can often make more than men. If she wants to cheat her way through life, let her earn her way through life.
DNA testing has changed other laws. Paternity support for children who aren't yours will also bite the dust. Feminist money grubbers cannot stop DNA technology factoring into more and more paternity/child support cases. There's even a new TV show this season that deals with incarcerated criminals being freed by new DNA evidence