Why should a man be made to pay child support if the man was in favor of abortion?

Kind of inspired by another question, but totally unrelated. Yea, I’m going to get some crap over this, but lets see if any of that crap actually makes sense.

So, hypothetical question. A man and a woman have sex, the condom or pill fails, and the female gets pregnant.

When the man finds out, he states clearly that he is only in favor of abortion, but the female has the child anyway.

Why should this man now be expected to pay child support? To me it makes no sense.

Sure, if the guy is not in favor of abortion, or even up for having a kid, but then tries to back out child support, then yea, what an ass. However, if he clearly stated that he does not want a kid, why should he be made to pay?

When I think of the topic, the words “jizz thief” and “prostitute roulette” come to mind.