The seats are assigned. People have been standing in line for 15 minutes now. Why on earth would anyone want to stand there, when they could just sit and wait until the line clears?
I understand wanting to get off a plane ASAP, but boarding? You just end up sitting on the plane, waiting for everyone else to get on.
Good question, actually it all happened a few days before I even got to the airport, so I was aware which flight I was supposed to take. I don’t think that really technically counts as “denied boarding” but it seems like they probably did it because my original flight was very oversold.