Mary, Jim, Sue, Margaret and Stan all work together.
Margaret cannot get the vaccine because of an allergy. Margaret must rely on her coworkers to protect her through herd immunity. If they are unable to get sick, they cannot get her sick.
Mary, Jim and Sue get the vaccine. Sue is exposed but cannot catch it because she has immunity, so her vaccine has kept Margaret safe. She has protected herself through her actions, but she has also protected Margaret.
Stan does not get the vaccine and trumpets that his choice should be respected. He gets sick. He was in the office when he started to get sick. Margaret catches it from him, ends up on a ventilator for two weeks and dies.
Margaret did not have the chance to be protected by herd immunity because Stan did not join the herd.
Stan knew his choice did not affect him alone and would hurt and kill people like Margaret. But he wants his choice to be respected and he doesn't care about the blood on his hands and he wants to pretend that the blood isn't there. He wants to pretend that people like Margaret do not exist.
Sorry, that's not how it works with something like this. Your choice affects you a little but others by a lot. People have a responsibility to take care of the weakest members of society, including the "infirm," the people who's health is not well.