What Zou said.

Also the basic philosophical problem with the whole concept of guns. They're tools designed with no other purpose than to kill fellow human beings. Owning such a tool, let lone carrying one around, "just in case" you might need it takes a really fear-based and me-against-the-world mentality, or at least a high degree of toxic machismo. It's kind of like going to your family thanksgiving dinner with mace just in case your sister's kid jumps on you and tries to strangle you. Or maybe in case he tries to steal the stuffing off your plate. Also carrying a gun is a great way to let an otherwise small skirmish--say, in a bar while drunk, or experiencing road rage while driving--escalate into something deadly. If it were up to me owning guns would be illegal, even for police officers, like in the UK.