I believe a large concern in this is that not only does he become an unwilling father but he is also legally liable for this child and especially if married to the woman then legally has to provide for this child through the course of its life. This means food, clothes, school, college, medical bills. Anyone who has children of their own knows how expensive it is to raise a child and it is a commitment you must want to make. It is understandable that the man would not want the child to go to term.

Stipulating a compulsory abortion though opens a whole new can of worms. We aren't just talking about female vs male rights we are talking about an ethical right to life. It is already under huge debate whether or not abortion is ethical and many religious affiliations are trying to put an end to it. In the end we are talking about killing a possible human life form afterall it's not something that can be taken likely.

I believe a better alternative would be to legally annul his responsibilities as father of that child. For example a deceitful woman hoping to make a small fortune from a rich business man by tricking him into fathering her child and then claiming hundreds of thousands in compensation would have wasted her time. I'm not entirely sure of the current lawful responsibilities of a parent, afterall fathers walk out on their families every day, as do mothers but I have heard of women blackmailing the man through a bastard child.

Either way I definitely don't think Abortion helps anything, if not it makes it even more complicated and regretful.