Exactly. In addition to that, this recurring argument that compares vaccine mandates to mandates prohibiting "bad" acts is odd.
Legally speaking, mandating the vaccine is forcing a person to act (get jabbed) through no act of their own. Mandating abortion bans is prohibiting an act (getting an abortion). So the two scenarios aren't comparable.
they reduce it by a nonzero amount, which I believe to be an appropriate threshold, given the lack of common, significant side effects
you probably have a different threshold, which is okay, but it is likely one you will have to persuade the majority to adopt, if you want to get your way
It doesn't reduce it enough to provide herd immunity, meaning the virus will continue to propagate until every one has been exposed. See Iceland's experience:
Legally speaking, mandating the vaccine is forcing a person to act (get jabbed) through no act of their own. Mandating abortion bans is prohibiting an act (getting an abortion). So the two scenarios aren't comparable.