I live less than 90km (55 miles) from the nearest US border crossing, so it annoys me whenever a Trump supporter says "You're Canadian, why do you care? Mind your own business!".
Indeed, it's not like the United States is constantly telling every country in the world what it ought to be doing, and sometimes forcing them to do it, is it?
But to me, the kicker is that the current and previous two administrations have had a common policy, which is that foreigners (unless they have been lawfully admitted to the United States) have no rights, including the right to be alive. A legal researcher for the Obama administration spelled its reasoning out pretty clearly. The United States is at war with an unspecified enemy. The entire world is a battlefield. So if you are a non-American located on this battlefield, then you are a combatant. And combatants may be killed.
Nice, eh? I wonder how many minutes it would take for the US to invade any country that took that attitude towards Americans.
The FBI's own documents referred to Posada as a terrorist, and there he was, living in the US. The Bush administration, which brought the world "enhanced interrogation", refused to extradite him to Venezuela, for fear he might face "enhanced interrogation" there - in other words, the US decided to harbour a terrorist, because they thought Venezuela might treat terrorists the same way the US did. Do Venezuela and Cuba have the right to invade and occupy the US, killing a few million "combatants" (people located on the battlefield, which is the United States), because they are "fighting terrorism"? Does Turkey have the right to launch drone strikes on the battlefield that is Pennsylvania, because Gülen is there?
So a country has, for three successive governments, claimed it has the right to kill any foreigner it likes, any time it feels like it, and has made good on that a few hundred thousand times. And possibly more than a million, depending on whose counts you use. Even US figures indicate that more than one hundred thousand "combatants" (as per the above, non-Americans who are located on the battlefield, which is planet earth) have been killed; nearly everyone else's figures are much higher.
So their government claims it has the right to kill you any time it likes, and
you should mind your own business?
I don't know whether Biden will continue the "foreigners do not have the right to be alive" policy. When he was vice-President, his boss definitely didn't think foreigners had the right to be alive. And the person who ran against Trump in 2016 - well, there were few things that upset her more than the existence of a live foreigner.