In many circumstances - including when that person is married to a US citizen, or when they'll likely be killed on return to their country of birth - it is indeed crazy and cruel.

(In more ordinary circumstances it's merely arbitrary and unjust.)

I wanted to be a citizen of Singapore and was never approved.

I agree it was arbitrary and unjust. I deserved to be a citizen.

Yes, this is by no means only a U.S. problem. Some countries are worse, even where birth rate trends seem like they should make it more obviously self-destructive. A tendency towards xenophobia seems to be an unfortunate human universal, although one we can sometimes overcome.

When they're married to an American? When they have kids that are American? It's not crazy nor cruel, to you, to separate a mother from her infant?

You are demanding that their American spouse either divorce them or spend the rest of their life in another country. Of course it’s crazy and cruel.

The issue is spousal visas. I did not seek to marry a foreigner, our relationship was proximity turning into a whole lot more. We consider it cruel to tear apart couples.