“But in general this shows that they are taunting the world to come and smash them.”
Too bad no one in the world has the testicular fortitude to come and smash them!
Or they are demonstrating the scary prospect that we could have a terrorist gas attack in the U.S.. Very seldom do terrorists want to give one message or simply kill, they also want to deliver fer factor as well. We have been lucky to have not experienced a Tokyo subway gas attack. But sadly it could happen.
And as long as Bath-house Barry and his band of marxist miscreants is controlling US foreign policy, and the ball-less europeans are as impotent as they are now, ISIS will continue to do the most depraved acts possible just to show that they can, and that nobody will stop them.