Because they're anti-abortion, they get an enormous pass from people who believe they have some kind of moral high ground.
Abortions, at least late ones, should be a national shame just like death penalties.
Doesn't support everything else Republicans do but just wanted to mention this since your post made it sound like this wasn't an important issue.
Since it doesn't make sense to imprison the parent in an abortion doesn't mean it doesn't make sense to ban the medical practice of abortion. It's a silly argument, really.
See also sibling comment.