Well I am no legal eagle, but did these people not technically hijack the aircraft?
If I were in charge, I would look into what sort of legal action might be taken against them.
silverknapper,
I agree entirely with what you say. It really is about time the passengers displaying this sort of attitude were made to realise that they are not the only people on the planet and their actions might just have of wider repercussions.
In my view, incidents of passenger action like this are likely to increase unless positive action is taken to stop it!