Agressive & disruptive passengers removed from aircraft!
This would have been much better dealt with at check-in, in the terminal, where there is an available and visible police/security presence, IMO.
Passengers who won't pay extortionate, but legal and well publicised charges, can pay up or not fly. People who turn up drunk and act agressive should be denied boarding as well. Once they are on the aircraft the problem is very difficult to manage, as this incident shows.
I rarely fly FR but when I do I know what the rules are and what I am going to get for my money.