When you decide to align yourself with a decision for mass death, you need to make yourself comfortable with it.
To make yourself comfortable, you tell yourself a story.
This is their story.
These people are aligning themselves with this decision, and would like to get on with it without reminders of what they're doing.
Masks are a reminder.
Which reminds everyone that deaths can be prevented.
Which convicts those who have decided not to prevent deaths of their decision.
They dislike being convicted.
They don't think they're risking themselves. If they did, they'd demand masks.
These are the people who will go to court to free themselves from the dangers of gay wedding cakes or of science taught to their children.
They'd just like to get on with it unencumbered by visual reminders of what's happening.