Yes? But do you stoop to the level of the robber, or rise to the level of the law enforcement who come to your aid? If you stop or kill the robber, you have fulfilled the law. If you rob the robber, you have broken it all the same as he did. You'll find he took more than your belongings.
No, but they violated the order of things. They alone made themselves a threat. Violence was the only recourse to re-establish order. The reaction to them was just.
But there is a continuum of force we must use on varying levels of threats. Liberals who vote for a corpse to be president are a greater threat to me than liberals who ***** and moan at me on a political board. Those who would have power at the cost of sacrificing their humanity and other human beings in the process are the greater threats. But one thing I don't stop doing is failing to recognize them as human, like me.
And what do you do with threats like that? You vote them out of office. You don't stoop to their tactics. You don't become the evil you wish to confront. The example you cited, war, is an exception that proves the rule. It does not violate it. Revenge is often detrimental, killing is no different as it is in war.
I find that one's humanity, once lost, is more tragic than losing it a million times over. I will not do it. It is genuinely horrifying to me. The mechanisms in this universe are greater than any one collective of human beings, and it will not hesitate to swat us out of the way. That's how I see impertenent people in politics. People who grew too complacent in their power were swiftly expunged from the system, now the remnants flail with rage and search for a nonexistent solution to it. I won't act like one of them.
And excuse the longevity of my answer, but I felt like you deserved a detailed response, given you took the time to respectfully engage me.