Those brought up in a different culture and different value system that do not assmiliate will always be trouble. The British PM just got on TV last week and agreed with the German PM that multiculturalism has failed their countries (the US needs to take notice).
I don't care where you came from or the color of your skin, if you are a criminal, you need to either leave or die (jail is too easy). Eventually the US is gonna have to get tough, or kiss our tails goodbye...