JerryM: The theater, in and of itself, is not an inherently dangerous place...Colorado notwithstanding. However, danger can show up anywhere, at anytime. That's why most of the users on this forum [me included] carry firearms. I view my firearms as I do the spare tires that all of us have in our cars; you almost never need that spare tire, but when you do, you usually need it pretty bad. Since we never know when or if that tire will be needed, we always have it with us. That same logic could apply to vests as well.
Seen on a bumper sticker: "Exercise. Eat right. Take vitamins. Die anyway."