Again, as I mentioned, this is a very small slice of the Islamic world, a tiny one, thank goodness, but they believe with all their heart that in the declaration of the caliphate they're going to take over the world.
In America before 9/11, we didn't believe al Qaeda when they said they were at war with us. It finally took 9/11 for us to realize that they actually meant it. We need to take ISIS at its word that they want to expand this caliphate around the world, they'll do anything they need to do that, including killing everyone in this room.
We need to recognize that and adjust our policies to it, always respectful of our rights and liberties, always protecting the things that make our countries unique, but we do have to take measures that protect ourselves because these guys are serious, it's real, and they're bad people.