@Beezknees ,
I think we are trying to have a black and white conversation about something that has plenty of shades of grey.
There are feckless men, whom I would judge as harshly as you. But there are also dishonourable and dishonest women who, morally, should either decide to be solo parents, in every sense of the word, or better, have an abortion that they have previously agreed to.
For example, on the one extreme, a married couple who have separate finances and already have children. The woman gets pregnant accidentally and she decides she wants the child even though they have always agreed to only having two children. I don’t think anyone could dispute the father morally has to pay.
OTOH, two uni students who are both going their separate ways agree to have a short fun relationship. She is on the pill, he uses condoms but they have agreed, if the worst happens, she will have an abortion. The worst does happen and she changes her mind. I don’t think, in these circumstances, particularly if there is no danger of the child suffering (maybe she has a large trust fund), it would be fair to ask the father to pay.
I am sure we could both think of even more extreme examples (a female teacher seducing a male minor, or even a 32 year old lecturer with an 18 year old boy).
Moral issues are rarely black and white.