The key argument is whether the baby constitutes part of your body just because your body is used to support it. Parents need to support children, too. Should they have the power to kill them if the child becomes an inconvenience? Your bone marrow comparison is stupid,
you didn't commit a voluntary act which made someone dependent on you for marrow, thus you have no standard of care to provide that. Becoming pregnant requires a voluntary act which can MAKE someone dependent on you and there are plenty of ways to form legal obligations like this elsewhere in society, where you're now required to give a standard of care which impacts your freedom if you enter into the relationship voluntarily. Men understand this quite well, they have zero right to full autonomy after they have sex--every consequence from then on they are obligated to accept as the dependent human (Child) requires resources. Why are women special in this regard? Why does the baby not form a legal obligation with the mother when she
voluntary takes an action which
allows for its creation?
If you want me to explain how a voluntary act can enter someone into a relationship which then requires certain actions, come down to general. I'll explain why the idea of comparisons to forced medical procedures with zero previous actions that create dependence is utterly
retarded. The material fact is NOT about saving a life, its about the
responsibility one accepts to a dependent life by engaging in actions which can produce such dependence. Otherwise, keep this political shit out of the FSR, because you clearly don't have the balls to debate it.
Also, the whole 'difference between pro-choice and pro-abortion' is a relic if Liberals past; the modern progressive movement does not see it that way at all, at most women's marches they hold "abortion sharing celebrations" where women can recall how amazing their abortion was in terms of their current freedom. There is a reason why people are sick of it.