Who said it was peaceful?
Did they have a permit, if one was needed?
Were they in a public area? If yes, did they comply with the officers requests?
Were they impeding traffic? Blocking pedestrians?
Were they using profane language?
Was anyone trying to incite a riot?
Can you answer any of these questons?
Neither can I, because like you, I wasn't there. You're making a pretty big leap in logic with you last statement when you have no idea what occured at the protest. I said the cop overreacted and I stand by that, but who's to say they police didn't have a reason to step in, in the first place?