[jackvalentine]

He has every right to remove a passenger who is causing a disturbance or presenting a threat.

He doesn't have the right to because the airline wanted them off in breach of the contract of sale and the guy said "yeah no".

Refusing peacefully to go along with the fiction the airline has created isn't causing a disturbance. You can't force someone in to a "disturbance" state if they're just sitting there。

[dragontamer]

Look, involuntary bumping happens on every airline every day. The fact is that you don't have a right to fly if the airline or captain doesn't like you for any reason (aside from protected discrimination classes, like race or gender)