He was clearly injured when being removed from the airplane, through no fault of his. He had legitimately booked a ticket and was sitting in his booked seat. Random selection of passengers to be removed after the plane was overbooked, with the airline not allowing for seats for their own staff, led to him being selected to be removed from the flight, along with three other people. Two offers were made to passengers to give up their seats and when none would, the random selection was put in place. So what were the offers? Future travel vouchers, I expect.
Random selection should not happen. Airlines should offer enough that people will agree to a flight change. We once received flight vouchers as compensation and when we used them, it cost us nearly the same in airport and travel taxes as we could have booked a cheap airline flight. No, I don't understand that either, but I do understand airline vouchers for future travel are a rip off. Don't accept them.
It is quite simple. Airlines wrongly overbook and when it goes wrong, they need to offer proper compensation to encourage people to inconvenience themselves by changing to another flight.
There are some bad things that happen with camera phones, but in this case, that the actions were widely recorded really makes the point.