By labeling that segment of the population, "antivax", it dehumanized the individuals into a hive minded cult. Some may avoid all poison, some don't like needles, some are willing to risk 99.994% recovery rate, some didn't believe in coldvid, some don't trust government, some believe bill gates Ted talk when he claimed they could use vaccines to reduce population, some just didn't want to take time off work, some don't do vaccines, some believe it was biological weapons, and some vocalized their resistance to anything developed under trump. Lumping all into anti or hesitant status is a dehumanizing technique that allows actions against a group that would never be acceptable against an individual