I don't think this was exactly how it happened. The story I've seen is that Dao and his wife actually did leave the aircraft, but returned to their seats after they learned that the next flight from Chicago to Louisville wasn't scheduled until the following day.
I always consider something like this a big red flag when I'm traveling on a commercial flight, and I'd never even consider doing this myself. I'm always sensitive to this sort of thing from hearing stories about flights facing lengthy delays because of what is deemed an "unauthorized entry" to the aircraft.
There are all kinds of problems here that could easily have been avoided by all parties involved.
Every piece I’ve seen has Dao leaving and coming back only after he was beaten. Granted, media credibility is always suspect to me, but there is absolutely no excuse for the airline practice of randomly kicking off boarded and seated paying customers. There is no excuse for how those three security types handled the situation, dragging the man down the aisle like that. It’s totalitarian behavior and we, especially as conservatives, should never condone such.