That picture says it all. Both seated passengers just realized their hope and plans for a nice flight just got dumped on. Mr. Big is too big for that middle seat, but his fellow passengers will pay the price for his lack of courtesy and respect for others.
Lesson for the large, Purchase two seats or a first class seat.
The airlines should figure out a way to deny them boarding if the flights of others is to be that affected. I would quit flying an airline that subjected me to that.