“...bandoning their countrymen...”
Personally... if someone leaves the country and their citizenship behind, they can go to Hell. I could care less what happens to them.
May posterity forget they were EVER our countrymen.
I don't even care that much. If someone chooses willingly to forsake America and their American citizenship, then I say bon voyage and good luck.
It's when they turn around and start mocking us who stay, that I drop any pretense of civility. They can KMA, then proceed directly to whatever hell they choose over MY country.