The research shows that deterrents work. The more there are in place, the less likely the acts are going to be committed. That’s why gun owners have such a high success rate with suicide. It’s much easier. You can all keep insisting that the attackers will switch to the next best thing but if that was the case, every other country in the world would have an equal amount of murder sprees, just committed by cars instead? Reality shows that mass killings in developed countries happen predominantly in the US. Why is that?