One factor in this decision is the fact that people who have legitimate questions are answered with "You're dumb and anti-science! If you don't take it, you'll lose your job, and never be able to get on an airplane ever again!"
How should a reasonable person respond when honest, good-faith questions are answered by suppressing the questioner with name-calling and government-sanctioned force?
I personally choose to: Ignore the names. Resist the force. Assume the people encouraging the name-calling and mandates have bad motives. If they had good motives, they'd lay all the cards on the table, give me honest, good-faith answers (which might be "We don't know" or "Yes, there are some safety issues"), and then let me freely choose whether I accept a medical treatment into my own body.