It's natural selection, stupid people don't get vaccinated, stupid people die off more often, everybody wins.

It doesn't work this way.
Forget about voting, nobody except the medical staff can have any right to vote here. Vaccination should be forced for everybody who don't have any specific contraindications, because collective immunity allows us to protect unvaccinated people from getting infection.
It's not a place for the "democracy", because it's about survival. Only massive and forced vaccination was able to exterminate such deseases as polio and variola. The same is correct for measles, rubella and many other infections.
Stupid people must be vaccinated, otherwise some smart people can die too. The only who benefits in this situation is the virus, due to possibility of natural selection for vaccination-resistant strains. If viral genome is unstable then partial vaccination of society is potentially able to create vaccination-resistant strain.