Police attacked this person because:

[Riot]

Originally Posted by MaTH716

And your point is?

Clearly the peaceful American citizen standing there videotaping, moving back as the policeman asked him to, was more of a threat than those above I mentioned, and justified a cop coming up behind him, throwing him to the marble floor, stripping off his shoes/coat/backpack, sitting on his throat with four other cops, and arresting him for .... ?

The American right to peacefully protest is not related to one's cause, or one's public support, nor does it need permission from the government.