There is another possible explanation for the decisions made by some of the deniers and anti-vaccers,.... Fear of dying from Covid
This fear can be removed from them by deluding themselves into believing that Covid is a myth and they know that a mythical virus cannot affect their health,
If they accept the vaccine then they undermine their confidence that Covid is a myth,
They do need to face up to the realities of life, the risks and options like adults.

