Quite often, "doing something", especially in haste, is the wrong thing to do. After all, after Sandy Hook, the antis insisted we had to "do something" and jumped into action doing precisely the wrong things.
Of course. If you are in a movie theater when shots ring out and you see two guys shooting at each other, don't shoot the family of four huddled together behind the chair next to you. I think that is the analogous lesson to be learned from the antis "do something".