Any time this is attempted, it is met with enormous governmental show of force. No matter how peaceful the dissent, the US government is not tolerant of it.
It is? I'm not saying you're wrong, but I haven't seen legally organized protests (yes, you do have to file the appropriate paperwork) recently which have actually been shut down by an enormous governmental show of force. Do you have any examples?
Occupy Wall Street, the Seattle WTO protests, off the top of my head.