[ClearCase_guy]

Regarding Dao, it’s well known at this point that the flight he’d booked a ticket for wasn’t oversold as much as United wanted to transport four crew members to Kentucky in order to staff a flight the next day.

Right. Say it again: "It wasn't oversold." That is a tremendously important point.

So that the airline could serve many more passengers, it bumped Dao, along with three other willing customers.

Really reaching here. United has a responsibility to serve many passengers in many cities. That is a corporate matter. They were pretty clearly failing at doing that, since they didn't have personnel in the right places and didn't have a good way to get their personnel to where they were needed. Beating your paying customers unconscious so that you can provide good customer support must be something they teach at Harvard Business School. In the real world, it's a "no-no".

[BatGuano]

“Beating your paying customers unconscious?”

That statement proves that you did not see the video or you are on the passenger's side no matter what the facts are.
Dao beat him self by twisting and making sure he drew blood by hitting as many seat supports as he could as he was dragged from the airplane cabin. Would you have acted as Dao did in this, “CASE?”