Let me put it into lamen's terms for you then:
Every other patron in the movie theater trying to watch the movie undisturbed trumps anybody with any emergency still yapping on their phone while still in the theater (including the loud, annoying ring)
Heh if it was your family emergency, would you still think that?
I agree that calls can be answered away from the movie or whatever, but the ability to receive them should not be restricted.