being anti and wanting a law that strictly prohibits it for everyone, also strips them from the ability to make a decision

Ah, here is your first issue - you expect rational thought. It isn't, they aren't.

Forcing someone to something regardless, e.g. bearing a child is one of the extremes, not some middle-ground in between..

The woman's life, opinions, etc, dont matter to them. Its a middle ground for these men, nothing else. I'd also say I'd assume for them its more about controlling what a woman can do, and what they believe is the purpose of a woman. Which is why I say there are likely religious undertones behind a lot of it (or just straight up misogyny).

You'd need a proper reason to force people to do something

"I'm the guy and this is what I want" - that is their reason.

Dont expect any sort of coherent or rational thought from anyone anti-abortion. Either they are incredibly ignorant, misogynistic, or a religious zealot.

Or, more likely, a combination of the three.