When I wrote that I was correcting something you had previously written where you incorrectly stated how things currently work. That's why I mentioned the law.
Of course, everything we have is by choice, even the law. There are social, cultural, and practical constraints on women that men do not have, and the tradeoff is that men have medical choice and financial constraints that women don't have. Them's the breaks.
I see no societal benefit to changing our laws to allow men to abandon children they father outside of some emotional appeal to 'fairness', which I am entirely uninterested in.