There is only one way to deal with people like this...Divert.
As soon as possible and put into somewhere that is going to have rather unpleasant Police and will cost a fortune to get back from.
The German Police and legal system can be pretty harsh, or putting into an island like Sicily can be difficult for the moron.
Any extra costs should be sued for by the airline.
The passengers should be compensated say £100 per person per hour by the offender. (If they go bust then tough).
The airline should put them on a no fly list and all other airlines should be encouraged to do the same.
Air Rage would be a thing of the past PDQ.
However as incidents to get out of hand quite quickly because of a misunderstanding, then an alleged offender can be offered to move to say a row of seats at the rear of the aircraft.
That way he can show he has made an effort to also defuse a situation.
If they refuse and continue being disruptive, then divert time.