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This is a very subjective statement.
This is not really a matter of being grown up or not. This is about standing for something that one believes is their right.
I agree with you in that we have a court system to resolve disputes. What I don't agree with is that there should be "the chosen ones" in the society - in this case a big company - who can apply force instead of resolving dispute in the court.
Exactly, this is why the airline should not apply force towards him. You're setting double standards here - airline applied force = good, passenger kicking = bad.
I can't imagine living in a society where the airline is allowed to fix their fuckups by using a force towards a paying customer. They should let the passenger to stay on the plane and fight it out in court if they like afterwards.
Yes, finally. Airlines should not be allowed to overbook. Period. I'm pretty sure most of the people would be more than happy to pay a little bit extra to have guaranteed seat.