Well if they are 30% now, they must have the 'evidence' that convinces them they are right, when they are 60% they would have even more 'evidence'. Why wouldn't they blame it on, the eastern europeans or something?
And I'm assuming we still have the same rule of law as now and they don't just make shit up, because I'm modeling my fellow humans as having a different (in this case, empirically and from a risk calculus wrong) perspective, not as evil. So they can't abandon democratic principles. Vaccine mandates are coming as a last resort now due to exactly those principles