I think it is safe to assume that the US government allows street protests, but within a limited time frame.
After that, they get just as brutal and violent as the Malaysian police.
Any instance or place in which the authorities get violent on peaceful dissenters is wrong. And these instances should be documented for all and sundry to see.
Check out: RAW VIDEO - Cop Runs Over Wall Street Protester's Leg
We can't always rely on the mainstream media, for most of the time, they are owned by corporations that have a vested interest in keeping certain news from public knowledge -- especially if it concerns them.
That's why we need Citizen Journalists.
Gizmodo has given a comprehensive list of things to do and not to do when playing the role of Citizen Journalist.