Evil, cowardly idiots. This time may have involved a military target, but these are the same idiots that slaughter aid workers, children, whatever innocents they can. There's nothing crafty about that.
Evil? Yes. My point is that we should never underestimate these guys. Satan himself is described as evil and crafty. These folks are trapped in an evil, demonic world view and are motivated by forces way beyond what is seen by the naked eye. Enough said for now.