I see the point you’re making, and I don’t think it’s a pro-abortion point. However, I think that its logic is weak because it isolates a case in theory that isn’t isolated in reality.
“A law that forces pregnant victims of rape to give birth” is simply “a law that makes abortion illegal.” It’s enforceable to the extent that it’s enforceable on the ground, irrespective of the reason an individual mother does not want to give birth.
For any law criminalizing abortion, the enforcement would, in all likelihood, be prosecution of abortionists. In the absence of easily accessible abortion facilities, the issue changes, in most cases, from “preventing abortion” to providing care for mothers, however they conceived, and homes for babies, however they were conceived.
The thing is though, Tax-chick, how do you stop a woman from running belly first into a wall and doing it herself?
This really is no different than does the law against committing murder stop people from committing murders?
In the situation of a rape pregnancy or any other pregnancy that may end in abortion, it boils down to convincing the mother not to do it.
Establishing a law that punishes the behavior after it occurs isn’t going to stop the behavior as is evidenced by every single other law.