There is no purpose to do a dry run. There is no purpose to be overtly Islamic, draw complete attention to yourself, act like maniacs, travel in giant groups--no purpose what so ever---and, no, their intent is not to terrorize us, it is to kill us, break our will and convert us. They could care less if you are terrorized.
Yeah, I do believe this story but I also believe it's not what it seems and no I wouldn't have stayed on that plane either.
There was a story, not too long ago, about 7-8 Muslims distributed throughout the aircraft and talking on phones and, in general, being disruptive. They spoke in loud voices in Arabic upsetting the passengers to the point that the plane had to return to the gate.
Later there was talk about suing the individual complaining passengers, but surprisingly nothing came of that.