"And where then does it stop? Should countries also not be required or require themselves to provide due process to citizens of other countries when they visit?

"And where then does it stop? Should countries also not be required or require themselves to provide due process to citizens of other countries when they visit? How about not recognizing property rights, and confiscating their belongings? Why not go the whole way and just shoot the ones you don't like?" Well, something like that is already considered quite legal, right? A Uruguayan citizen who buys some pot from his local government store and then boards a plane to Singapore isn't going to have a nice time in Singapore, even though by Uruguayan standards he's done nothing wrong: his property rights in that pot will not be recognized, at the very least, and probably he will be severely punished for something not considered a crime in his home country. When country A is doing violence to the citizens of countries B and C inside country A, the usual response is merely that B and C recommend that their citizens not go to A. If the citizens were considered important, sometimes there's a protest of some sort.