@ Seraphim: reason and logic don’t work in the USA when it comes to this subject, hence you have a problem.
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Statistically, the availability of guns has little correlation to the level of gun violence. Some of the most well-armed countries in the world (ex: Switzerland) also have the lowest crime rates. What makes the difference is the attitude toward violence of the citizenry in general, not a particlular method of violence, like using a gun. Gun violence, or any violence, is a symptom of a much deeper issue, not the cause.
If all guns were made illegal, and certain individuals resorted to using steak knives to attack people, would you suggest outlawing steak knives? Or, after outlawing steak knives as a result of escalating knife violence, these same people began killing people with rocks, would you suggest outlawing rocks?
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Incidentally, for your information, criminals do not obey the law. Shocking but true. If guns are outlawed, criminals still have them while law-abiding people, because they obey the law, have been disarmed. Legislation does not fix the underlying problem.