Disturbing dream

I woke up from a disturbing dream this morning. It appeared to take place in the sanctuary of a modern church where I was attending a group therapy session. Prior to the start of the session, in the vestibule, two new members joined us: a middle-aged woman who I'll call Karen, and a younger dude with stringy beach-blond hair who I'll call Jake. (I didn't know their names during the dream.) While Karen was monopolizing the therapist's time, Jake was wandering around oblivious to what was going on. At one point I noticed Jake's absence and looked up at a monitor, which showed the smoking ruin of a distant part of the church campus where a bomb had gone off, unbeknownst to anyone else present. After the session most of us stayed for the regular church service, which was interrupted by a squad of police officers who had come to arrest Jake for the bombing. I was shocked by the way the officers waved weapons around at innocent actions like holding up a hymnal to sing. After I woke up, I realized I was actually quite frightened, and it occurred to me that I had never actually experienced anything like that before, so where did *that* come from?