My recollection of the video is that when they finally pulled him out of his seat, he fell onto the arm rest. I do not think the police officers "slammed his head into the armrest", I think he fell into it after they pulled him from his seat.
This is the sort of thing you can expect to happen if you actively resist security personnel on an airplane. This is why it is a bad idea to do it.
“This is the sort of thing you can expect to happen if you actively resist security personnel on an airplane.”
No this is the sort of thing you can expect to happen in a Police State when people get their ass kicked by the police for doing nothing wrong and acting in a legal manner.
Your recollection is wrong. United has admitted that excessive force was used. They’ve said nothing like this will ever happen again. Even their own flight attendants who watched the video blamed the thugs for slamming Dao’s face into the armrest. They said the thugs should have raised the armrest to its upright position. What more do you want—a reinactment complete with a concussion?