re: Their country is theirs; let them sort it out. Or not.
Problem is they aren't content with keeping it inside their borders. They see their trials and tribulations as part of a much larger problem. Their solution to the problem includes doing away with anyone in the world that does not share their views, and that includes the US.
What do you want to do, occupy and attempt to control every country on earth that might harbor people who have antipathy toward us?
"Problem is they aren't content with keeping it inside their borders."
Who was Zarqawi before we showed up there?