As wrong as I feel it was for her to use him to get pregnant (without his informed consent) in the first place, that was small potatoes to then turning around and robbing him. I just can't see this in any other light.
Maybe in a few isolated cases "child support" is justified. In a case like this- no way.
OK, so that is just my opinion, but it sure made my estimation of the person's character crash through the floor. No, this person makes no pretense of being a libertarian, but sometimes I am still shocked at how low non-libertarians can stoop.