The very essence of a system is in how it deals with bad actors. Otherwise, we wouldn't need a system in the first place. If men were angels, there would be no need for a state, as there would be no need for interpersonal force.If we're going to indict the system using people who actively violate its enforced rules as examples, then this is fair game. Women who don't want to deal with raising their kids can "leave the state" or otherwise shirk responsibility just as easily, if they're willing to break the law.
Do you really think men and women, in general, have the same biological reactions to their own children? Even you can't be that shortsighted.