There are some who are deeply indoctrinated. For them, you not bring vaccinated singles you out as the "other" that is the cause of all their fear. The likelihood of pulling these people out of their psychosis is almost zero, but attempting to could lessen the depth of it. These are the people who will send you to a death camp. They are dangerous. There are others who are not so deeply enthralled. For these people they may be feeling a profound sense of disgust in their own cowardice. These people may respond well to empathy and compassion, but will react aggressively if you point out their flawed decisions.