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If your (state, country, whatever) has a 100% vaccination policy to "prevent mutations", then how can you possibly not have a vaccination passport?

There is no mandatory vaccine policy in the US. Where are are there?

So how will "everyone be vaccinated"? It won't be mandatory, but I'm sure it'll be difficult to refuse.

It won't be mandatory, you'll simply lose a bunch of - entirely optional - rights, such as the right to travel abroad :)