Not everyone who is refusing the vaccine is doing so because they think it is ineffective against Covid-19. Some are concerned for it's potential ineffectiveness against Covid-20, Covid-21, etc., and it's unknown long term side effects.
Probably the best article on the effectiveness out there right now with 500k participants.
In the past year, I've had pneumonia, DPT, and shingles vaccinations.
I'm not antivax, just watching and waiting...
Kinda like how I didn't jump on the Sig 320 bandwagon, even though it looked good on paper, some early reports were concerning...