I don't doubt the pattern, but the conclusion is not good. We continue to do what we should. This tragedy does not change the decisions that should be made, the best decision that can be made, for any of us, if that decision involves aggression. The inciteful political speech from extremist media and the perpetrator should be subject of civilized investigation that never loses sight of principle.
Discussion
My aggression shall be limited to the defense of me and mine. My tendency to avoid or de-escalate violence will be greatly attenuated. No talking, no warnings, immediate violent response when needed.
When war reaches me, the enemy will know war.