Does this surprise you?

As I understand, United went by the book. They offered passengers to sell back their tickets for up to $1,000. There were no takers and United used the routine computer process to pick the passengers to remove from the flight. No favorites, no discrimination. The Doctor dug in his heels which led to a forced removal. The brouhaha delayed the flight by two hours causing other passengers to miss connecting flights as well as flights to be covered by dead-heading crew members. The good doctor by digging in his heels could likely have caused serious inconvenience to thousands of people.

Planes are overbooked for lots of reasons. Sometimes then have an airplane weight situation, or have to make an equipment substitution at the last moment. A weather delay in San Francisco could turn into a crew shortage or equipment substitution in Louisville.

I think the Doctor should be arrested. He was directed by the airline personnel and security guard to deplane and he refused.