There may be good reasons why nobody gave up their seats for him. The guy who took the video that’s been posted all over the internet has been quoted as saying he thought Dao was basically a pain in the ass.
If I was on that jet I would be super angry at that guy for delaying EVERYONE, after all, three other mature adults left the plane and he should have too and taken it up with the Gate Agent and then file a lawsuit if he felt he was being treated unfairly by being randomly selected.
I would never consider throwing a fit and causing the entire passenger load be late. IMHO, he is a third-world scat that feels he is above everyone else and threw a temper tantrum worthy of a spoiled a 2-yr old.
He is guilty of conduct unbecoming a responsible and mature adult.
(I shutter to think what he is like as a doctor, and after watching him thrown a toddler temper tantrum, I would imagine his patience would not be too comfortable with having him as their doctor.)
Just sayin’