Accepting that is a true dichotomy, what I'm saying is when people tell you who they are listen. Certainly the police can shoot a guy in the head for threating non-lethal violence on another under appropriate circumstances. If a group takes over a building under the banner of an admitted criminal enterprise funded by the same threat of violence, a banner of violence and declared unlawfulness, I'm not sure that makes a difference. In otherwords, I think the grayness isn't in the law as you describe it, the grayness is in the complexity of human interaction.