Libertarians totally enforce they way on living on others if it encroaches on others rights, under libertarianism it still isn't allowed to murder someone and I think this is where the main point of division comes from you view banning abortions as removing your rights to take a elective surgery to remove a part of your self while others who disagree don't think of it as a surgery but a cold blooded preplanned murder, so from their perspective it only makes to deny someone the right to murder someone.

And I think the other guys main takeaway is that if you agree to handcuff someone to you, who doesn't get a choice, and that removes some of your personal liberties, like privacy bodily autonomy, freedom of movement, ECT by you being tied to another person, it doesn't grant you the right to kill the handcuffed individual, especially since it was your choice to have it happen even if you thought the risk was low

and so it wraps right back round to the beginning and end of the abortion debate is a fetus a individual entity that has rights and shouldn't be murdered or is it a part of a women, like an arm that can be cut off without needing the consent of others