United airlines had police/security forcibly remove a passenger at random because they overbooked the flight and could not find passengers to voluntarily give up their seats to United employees. This man told them he was a doctor and had patients to see in the early morning and could not give up his seat, so the flight crew called security in instead of offering more compensation to find a volunteer. The police/security guard quickly escalates to violence and yanks him backwards out of the seat, hard, which slams him head first into the metal arm rest across the isle, knocking him unconscious, and then drags his bleeding limp body down the isle to the horror of other passengers.
To be clear, this man did absolutely NOTHING wrong to be removed from the plane, he simply refused to voluntarily give up his seat, reportedly to United employees that wanted to fly on that plane, like all the other passengers there who also refused to volunteer. There were a myriad of better ways the flight crew could have handled this, starting with not overbooking paired with accepting that a paid ticket is a contract and followed by not assuming their employees who were apparently flying without reservations or tickets should get first pick of seats over paid passengers, and ending with offering whatever it takes to get a volunteer instead of randomly kicking paid passengers off the plane.
This is going to cost United FAR more than it would have cost to buy a volunteer, hundreds of times more. There's no excuse for this. All involved need retraining at the least if not dismissal.