What would someone have to offer to entice you into killing someone? Or to entice you into killing thousands of people? The FBI has just caught Mohamed Osman Mohamud trying to kill 25,000 Americans at a Christmas tree lighting ceremony in Portland. That means the silly season is once again upon us. Not the holiday season — the entrapment season. It comes around, as surely as Cialis commercials follow NFL opening kickoffs, every time the FBI catches a jihadist trying to mass-murder Americans.