My guess is that you are in law enforcement, and thoroughly brainwashed by your training. Otherwise I cannot believe you are trying to justify that thuggery, that you actually tell yourself it’s ok because he is preventing mass murder. Maybe your old mother will get this treatment some day when she wanders out of a nursing home, and the cop who finds her wandering in traffic prevents her committing mass murder by beating the everloving crap out of her like this...
Your guess is wrong.
Rational thought.
Try it. You might like it.