Long thread is tldr; but from watching the video, my thoughts were along the lines of...
"Wow these cops are being harsh, wtf is this?"

Then, after some thought, became...
"Wait a minute, how were these guys NOT protesting?"

Apparently the guy that got choke-slammed has his own show where he spends all his time protesting about various things, so it's kind of BS that he can play the victim when clearly he's breaking a perfectly rational law (you can't just protest wherever the hell you want to, after all).

Edit: Also, the guy has a public event where people are invited to come to the monument on saturday and dance there. If this isn't a blatant display of protest then I don't know what is.