I'd like to invoke a quote taken from a statement of solidarity with the occupy movement written by Egyptian activists and rebels:
"It is not our desire to participate in violence, but it is even less our desire to lose. If we do not resist, actively, when they come to take what we have won back, then we will surely lose.
Do not confuse the tactics that we used when we shouted "peaceful" with fetishizing nonviolence; if the state had given up immediately we would have been overjoyed, but as they sought to abuse us, beat us, kill us, we knew that there was no other option than to fight back. Had we laid down and allowed ourselves to be arrested, tortured, and martyred to "make a point", we would be no less bloodied, beaten and dead.
Be prepared to defend these things you have occupied, that you are building, because, after everything else has been taken from us, these reclaimed spaces are so very precious."
Perhaps those who write the content on the Occupy Portland website should keep this in mind and think twice before denouncing marchers for daring to be angry and daring to act in self-defense.