They lost their daughter to an enraged gunman five weeks ago. Now Louise and Nelson De Sousa want to try to prevent a similar tragedy from striking another family.
"No, try not. Do or do not. There is no 'try'..."
That's another way of saying the only way to stop a rampaging madman is to "use the force." And the most effective force to use when lives are at stake is the armed kind.
Either that, or you could stand up in the midst of a massacre, point at the shooter and declare that he's going to be recorded in a centralized registry...