As a non-American I don't care what you do, if you want to behave like irresponsible idiots without any regard for the lives of others you have that right. Just don't subject vulnerable individuals in other countries to your own bad choices (you can get the MMR vaccine as an adult if your parents were neglectful). Maybe visitors from the United States should have to present vaccine certificates at airports or be quarantined at their own expense.
> you can get the MMR vaccine as an adult if your parents were neglectful
if you are still alive.
Canada and the UK have a ton more measles than even the US's completely unacceptable level of measles.
Thinning this is a US problem completely misunderstands the nature of the misinformation problem.
And I hope there's vaccination requirements for travel, according to how public health officials determine threats.
Canada already lost their measles elimination status and had several times higher measles rate than the US.
At this point, anyone pushing anti-vaccine thinking as an American problem is just pushing anti-American bias. Vaccine misinformation and hesitancy is an almost worldwide problem.