At least where I am, one of the tactics that the right-wing protestors engage in is to walk right up to the limit of the law and greatly antagonize the left-wing counter-protestors. When the counter-protestors respond, they play the victim card and the police arrest the left-wing.

Sort of like antagonizing a kid on the playground and then telling teacher when you get socked. Sure it may not be right for the person you antagonized to hit you, but you knew exactly what you were doing.