It is funny that the regimes they cite as murderous are all Communist while at the same time they advocate leftism and many of the tenets of redistribution and class warfare so adored by the Commies. Our resistance to being disarmed, big, overly powerful govt, and adherance to the Constitution all act as a barrier to what they are worried about. Their actions assist in ushering in tyranny.
In my state it is clearly written in the law that a citizen has the legal right to use deadly force to resist unlawful arrest if that is the least amount of force that would be effective. I don't think anyone would dispute that. What they are talking about though seems to be resistance to to legal arrest. American police historically have not been without fault but they are a far cry from the death squads of Pol Pot, Lenin, Stalin, and Hitler.
We all possess guns to defend our freedom. Hopefully we would never allow purges and genocide in the US. I personally would fire on anyone who was trying to do the things the govts they refer to did. It can not be forgotten that while freedom is not quite what it was with the war on drugs, the war on terror, and modern survellience, the push back against big govt and the bad road it has taken us down has begun. The effort to restrain govt is not coming from the left either. Most of the bad govt originates at the federal level. The same level of govt the left has used for 50 years to stunt our freedom through taxes and regulation.
It seems like they are trying to blur the line between "Communist death squads are enroute to take us to camps. Die here or die there" and "we want to riot and the police won't let us break things and set things on fire". I think if they really thought about it they would conclude our Constitution, our Bill of Rights with the teeth of the 2nd Ammendment, and the personal courage of Americans are the best defense against what they fear from police.
I don't think that is what they want though. It seems they want to fan the flames until someone fires on police at one of their events. Of course if that happens they will deny anyone on their side fired the first shot. I don't think police in todays world in the US will fire into a crowd like the Syrian police. The left is becoming increasingly anxious to have a big event to keep their momentum up as far as the Occupy movement. They need to police to have an enemy. If the police were smart they would back off the protests until the citizens of their town demanded they take aggressive action. That time might never come but if the protesters go on the warpath it would. Right now the protesters want an incident to justify greater riot action on their part.