
I said why right there in the sentence.
You want that restated?
Brown was 18, no record, he pushed a store clerk and stole cigars.
I think it's more likely he pushed the door than it is likely he slugged the cop. He has no criminal record of fights, because if you are a black kid who gets in fights you have a criminal record. (See the School to Prison Pipeline: black kids get in a fight at school, cops are called and assault charges filed; white kids get in a fight at school and they get sent to the principal's office and a note sent home to the parents.)
It's one thing to ignore a police order to move to the sidewalk, it's a completely different animal to slug a cop.
It's not that easy to slug someone through a car window, while it's very easy to shove a door back on a person exiting a car, especially if that door just hit you and you reacted.
How is that not enough reason for my opinion for you?