Has the apparent spike in cases led to spikes in case rate for non-college students? Has it led to an increase in hospitalizations? Or do we need to "wait two weeks" for that? It's an extremely low risk population, it's very unlikely any of them will be harmed. As you said, they're adults, perhaps they are taking a calculated risk.
SCOTUS is already clearly partisan if the newly departed justice's final wish is for a different president to appoint her replacement. Playing politics up until the end.
“Society should treat all equally well who have deserved equally well of it, that is, who have deserved equally well absolutely. This is the highest abstract standard of social and distributive justice; towards which all institutions, and the efforts of all virtuous citizens should be made in the utmost degree to converge.”
—John Stuart Mill, Utilitarianism, 1861
If I lived there a long time, I still wouldn't be Japanese. Look, it's definitely an emotionally charged issue the longer someone has been in a place, but that doesn't change the basic facts. We can discuss the merits all day long but not the legitimacy of the government to decide who can and cannot stay.
For the purposes of this debate, "Americans" means citizens and those that can vote, the ones to whom the government answers.
But we're not talking about your decision or his, we're talking about the decision made by the government whose literal job description is to make rules for this country alone!
I think each nation[0] should be entitled to make decisions for themselves and have a right to run their state the way they see fit. I wouldn't presume to move to, say, Japan and then start telling them that they're doing things wrong.
As a nationalist, I think it would be better for those other countries to keep their skilled workers and so benefit. I think every nation has a right to its own existence, space, and policies. And they also get to decide what's right for them 'as a people'. Always optimizing for performance of 'the economy' is not in the best interest of the actual citizens of this country.
Politics is downstream of culture, and as the demographics of the country shift more towards those of Mexico or Argentina (for instance) we should not be surprised when our political climate reflects that.