How can you use force to get somebody to voluntarily leave the plane? Something here does not make sense, either the man doesn't want to get off the plane and they can find somebody else who does without the use of force or it was not a voluntary removal at all. Either way it seems the Airline has screwed the pooch.
I'm all for using force on the general public, most of them are ignorant and dangerous, left to their own devices they probably would have burnt the aircraft to the ground and rolled around in the left over jet fuel. However if you are gong to beat the public, (and you should try it, its a lot of fun.) at least have some defensible reason for it. For starters, applying reason to the situation normally gives you an advantage on them and helps to keep you out of prison.