Probably the main issue with vaccine mandates is a lack of understanding how they are meant to work at different scales. None of the Covid-19 vaccines claimed to immunise against infection at individual level - only to reduce virulence of the infection. This would also reduce spread, as 'less infected' individuals would be less effective as factories for the reproduction of the virus, so that the outcome on society scale would be quicker end to the pandemic.

[dupe] https://news.ycombinator.com/item?id=45118855