I would suggest you learn the history of why both N. Korea and Iran both hate and fear us. That might give you a little bit of a clue, so far all you have is an irrational fear. The tl;dr of this is we overthrew the elected leader of Iran and put the Shah in power, and we dropped more bombs on N. Korea than we dropped on Germany during WWII. I'll leave you to the history reading for the rest, but I gave you the short story.