Not all of it is that stupid.
The chalk outlines are easily recognizable imagery. Who cares if it's actually done, the point gets across.
Messing with small business is meant to be disruptive. It's not a good way to gain new allies but everyone is so polarized over this already so that hardly matters.
If the police follow people into peaceful indoor areas to pump more pepper spray on people's eyes, then they're much dumber than the protestors.