Draug, I agree with you, but for different reasons. The first is the moral reason: if it's morally wrong to injure, maim, or kill people, I don't think it suddenly becomes morally right to do so if certain situational circumstances are met. I realize this is a very inflexible/absolutist/pacifist argument that a lot of people here are going to disagree with, but it's one that carries some weight with me.
The second and argument is the practicality of violence in a domestic political situation. If you look at history, you will see that most domestic political violence is usually suppressed very easily and harshly. In the rare occasions when domestic political violence is successful, it almost always has some very serious unforeseen consequences - like the Reign of Terror, or the Bolsheviks taking over after you 'win'. Domestic political violence is a lot like picking a door on The Price is Right; you might get exactly what you're hoping for, but most of the time you'll get something completely unexpected. The American Revolution is one of the very few instances I can think of where political violence resulted in (more or less) exactly what the people who started it were hoping for. Even then, the cost was pretty high. An armed uprising against the government might succeed under the right circumstances, but then what? You may very well end up with Sicarius, me, the Black Panthers, the Montana Militia, the Unabomber, and the Communist Party all sitting in the Capitol trying to figure out how to get along if we can't all agree to radically decentralize the country. A situation like that probably wouldn't have a very happy ending and would likely be worse than the tyranny we deal with now.