Antivaxx was for decades a fringe left wing thing. Then they discovered the 'freedom' message and got a lot of right wing in. But there are plenty of lift wing areas in danger.
That's not how vaccinations work, and FYI around 3% of those that received 2 doses of the vaccine are still susceptible to getting it. So people in any state can still get measles & even those that have been vaccinated.
Yes that's the point. By purposefully hosting the virus they are endangering everyone who isn't protected because it's not a regional thing. It spreads on planes and in tourist areas. Which is why there's a case from LAX in California now.
Furthermore the more they willfully host it, the more it mutates and risks breaking the containment we do have on it.