Exactly,I have been wracking my brain trying to figure out how, what was his motivation, and why a 19 year vetran, Derek Chauvin, who would be vested in a year would do what he did.
"Motivation" isn't a concept that applies in some high adrenaline situations. There isn't time to calmly weigh different alternatives and wisely choose the best option.
The guy had something like 18 previous complaints against him. This was just him being him.
I suppose that's an answer,I'm still surprised that none of the other three intervened.