I'm sorry, I don't agree. The offending party (in the court of law) might be the security officers. But as a passenger, Dr. Dao bought the ticket from United a

I'm sorry, I don't agree. The offending party (in the court of law) might be the security officers. But as a passenger, Dr. Dao bought the ticket from United and it was their responsibility to treat him with dignity and safely transport him to his final destination. The situation arose due to lapse in United's protocols -- which was probably enforced by Chicago Airport Security officials. I could make another argument, for the security officers, that they were just following protocols. Maybe the gate agents let the security know that the passenger isn't leaving even after "politely" requesting him to. The security officers, hence rightfully, assumed he was a threat to other passengers and used force. All of this comes down to the fact that United started this, and they could have easily avoided the whole thing.