Your situation is different.

If you require a visa, you are by definition a guest in another country. It isn't the hosts' responsibility to take care of you if you fall ill. You have the choice to stay or leave.

Citizens on the other hand don't really have any options. Being unemployed isn't an option. Nor is becoming a citizen of another country for most.

When I went overseas from the USA to another country I had to get vaccinated as well. It's required. That's different. I'm neither agreeing or disagreeing with either point here, I'd just like to point out that it is different.