Absolutely - whether BA is in the right or not, it's open season on the subject of airlines and their treatment of passengers right now.
They need to step in and fill this vacuum pretty damn quickly.
Not sure there was a threat to the flight or passengers safety. I have been on Saturday night charters (not today or yesterday) and football/rugby planes and it was far from pleasant.But it was not a threat to the flight. A 65 year old as pictured is no threat to a flight and the biggest disturbance was probably to the calm serenity of the mid flight galley.
Put him at the back. Tie him up if necessary. Throw drinks and avios at the other passengers and voila you've arrived. Alternatively invoke "ultimate authority" and divert, return and climb into the high moral ground.
Captains have ultimate authority rightly but are also accountable in the event their ultimate authority results in a stupid decision (which this one looks like but may not have been if there is something we don't yet know). One might conclude that BA is not commenting because, you know, they screwed up.