It may seem crazy or stupid, but it works, believe it or not. In Switzerland, just about anyone over 18 is allowed to carry a firearm, and their murder rates are unbelieveably low, ranging from 5 or 6 per year. I'm not saying that guns should be handed out to individuals with a history of violence, or people under the age of 18, but I am saying that if criminals knew that someone they were planning on attacking or stealing from is, more likely than not, armed, then they would think twice before taking the risk.
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