I'm sorry, but that rings hollow in a country with the Second Amendment and a gun culture that likes to wax poetic about watering the tree of liberty with the blood of tyrants, or preach that school shootings are simply the price we pay for a free state.

You cannot tell a group of people that violence must be beneath them when they're facing a system that employs violence against them with impunity and often bends over backwards to justify it, in a culture which holds violence as one of the foundations of liberty itself. That would be suicidal.

Violence should be a last resort, but it can't ever be off the table, not in the US.

This is just false though. Sometimes violence is all you have left. Without violence, we wouldn't be a country. Without violence a black person would still be worth 3/5 of a white person. History shows us that violence is sometimes necessary. We arm police specifically because violence is sometimes required.

Violence was not the solution for any of the problems you mention, but the cause of a few. Maybe re-examine your rationale.