Great article!
And in some cases, it's passengers themselves who adopt this approach.
In September 2012, passengers aboard a flight from Chicago to Orange County reportedly tackled and restrained a fellow traveller with their belts. A newspaper report said the man had been warned by the cabin crew but the passengers took it upon themselves to restrain him.
Like I said, sometimes you may have to restrain a passenger for his/her own safety from the other pax.