I'm not precisely disagreeing here, but the problem is that both sides have made the abortion debate about when life begins. I've not heard pro-choicers argue that if you give the fetus the same rights as an adult, the legal right to an abortion would be unambiguous before 24 weeks. (After 24 weeks or so, a woman unambiguously has the right to end the pregnancy, but ending the pregnancy doesn't mean killing the baby at that point.)

That it even enters into our minds to consider that supposed fetal rights might justify forced pregnancy is evidence that Americans haven't really assimilated the first-class citizenship of women.

This is partly true, but also: people like babies an irrational amount. People you would never expect smile at them and coo at them. This is important for the survival of the species, because babies are really fucking annoying. If men could be life-support systems for fetuses, they wouldn't get free abortion passes either.