I get it. I didn't elaborate at all. I watched the video of the guy calmly walking along and breaking windows. No excitement. Didn't steal anything. With the umbrella over his head, he sure appeared to be doing what he set out to do, but remain unseen. Others didn't bother covering their faces, but this guy was a ghost.
Then I thought, "Who would do that?".
Then I thought, "Hey, that's going to make this worse."
Then I thought "Hey, who would do that?"
Then I thought "Making the rioters look worse.. who would that benefit?".
Then I thought "well, it sure would take a bit of pressure off the cops."
I know, I've read too many whodunnit's, and watched too much tv. It just looked really really odd.