Good point. I often find myself sitting near on-duty cops and EMTs in the theater.
Do you think that police officers and paramedics remain in their cars when responding to an emergency inside a theater?
Shutting off jammers in emergency conditions is as simple as the flick of a switch. That's a fairly silly objection. Note, though, that police do have to enter buildings that, by their architecture, limit his radio contact.
Many theaters have cops on patrol.