You might be interested to know then, without going into specifics, that the airline with the most in-flight restraints of pax by crew is not British/Aus/US...
Then again that might be more due to size and length of routes flown than of any tendency towards violence. I think Long Haul actually has more potential for things to kick off to that point because the durations of people to be 'stuck' are much longer, and people feel very cramped whereas probably don't mind so much on a 2 or 3 hour flight