Well, they don’t really have to come in. ISIS has made a show of strength that will have mightily impressed the disaffected Muslim radicals who already live here, so they are gaining new converts every day without ever crossing a border.
Bingo! Every Muslim in the world is going to want to join ISIS.
Good point Mr.Jeeves!
I agree. ISIS' ability to move so quickly has probably forever changed tactics against authority, globally.
The only question is if what's left of the civliized world will stop their games against each other and work together against ISIS and other such extermism, before we're all sent back to the Dark Ages.
Judging from the talk on GMA, it does seem that a lot of decision makers are still thinking about political advantage, not the survival of civilization.