The good doctor also should have been more logical and saw that his refusal to leave wasn't going to make them change their minds. While he was rightfully mad, by the time law enforcement became involved he should have understood that refusal to listen to them was not going to make his circumstances any better in any way and could only make it worse.
The later released longer video taken from a few seats behind does show the officers taking to him calmly and rationally, telling him he was going to have to leave or they were going to have to drag him off. The video starts at a time that appears to be well into their conversation so I don't know how long they were talking to him before they escalated to using force to remove him but it is clear they were explaining to him calmly that he was going to have to leave the plane and he could either do so on his own or be drug off, and if they have to use force he was likely to face criminal charges for refusal to exit the plane and he still refused.
So they did come in and try to talk him into exiting the vehicle calmly and rationally explaining to him that he did not have a choice and explaining the consequences, and he refused. The initial video was started so late or cut so short it looked like they just rushed in and grabbed him without even talking to him, now we know that not to be the case.
People throw around terms like "de-escalate" all the time as if if is some sort of magic method that makes everyone calm and rational and live each other. The truth is quite often people refuse to listen to what you have to say and are determined that they are going to do what they want to do or believe what they want to believe no matter what.