In wouldn't rule it out. But I know from what I have seen in my town that the 2nd paragraph is true. If you attack the polo with a deadly weapon and run away they will give chase and shoot you in the back. They are trained to do this because "for all they know" you are a threat to the general public as well.

It is best to keep the protests peaceful and if you are going to peacefully obstruct, stay cool and let them arrest you. Let them be the asshole. Of you panic or strike them then you won't live to protest another day and you may hurt your own cause. Regardless of if the officer enjoys or regrets shooting you.

The other angle the office get hit by the car. Can people run over cops now?