I agree that i may be unsolvable. But that is also point for 'pro-choice'. It is not symmetrical debate. It is debate about whether state is allowed to restrict some personal behavior.

In liberal society restricting personal freedom requires strong claim of necessity. Therefore it is a burden of 'pro-life' side to make such strong claim. As such claim requires fetus-person claim, the 'pro-life' side would need to show that (or at least show that it is universally hold position in society).