So I'm not trying to start a riot here but I have a question. Some people refuse to become an…

So I'm not trying to start a riot here but I have a question. Some people refuse to become an "American citizen " they are so against it but they have lived in America pretty much the majority of their life. So if you refuse to become one and feel so strongly about it and like it's such a bad thing then why do you choose to stay here?? I'm just trying to figure out what's the huge deal about it?