The country has to come to grips with the fact that there will always be dangerous maniacs waiting their chance to kill large amounts of people for whatever reason. Or no reason.
When you have an armed society like we have, these things, unfortunately, will happen.
What would be a lot worse, for now and into the future, is a disarmed society totally at the mercy of a tyrannical government or segment of the population.
We should do our best to try to keep deranged people from going off with the knowledge that stopping all them will be impossible.