It might depend on how selective the lethality is! If a small population is vulnerable then I don't have a problem with them protecting themself to the best of their own abilities (no mandates). This is fairly common already with the immunocompromised etc.
If a large portion of the population is vulnerable then it becomes more grey. I'm pretty uncomfortable with there being a large amount of preventable suffering but intellectually my brain wants to take a long term view. The best possible society in the future seems like one where humans have stronger immune systems and take fewer vaccinations, not more. Is this something we can evolve towards? Is my poor knowledge of biology leading me astray? Who knows!
Given I know nothing I'm happy to fall back onto the distributed decision making apparatus (individual choice).