Some in law enforcement are very insecure to begin with and when behind the badge it inflates their ego, makes them men...lol.
Then they are big men and will do crap like that instead of using his brain to reason with an individual.
Yes the driver was not following instructions but it could have been handled better imho.
Here in the Boise area of Idaho, we have learned that if you get pulled over you better obey the officer no matter how big an ass he is, if you don't you get shot dead.
I think these are LA throw backs now working in Boise.
Shoot first ask questions later...lol