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yes, it has been proven the world over the restrictive gun control leads to safer communities. The problem is proving the same in America, because all communities already have lots of guns. I grew up with a couple of shotguns and rifle being kept under the stairs in a safe and used to shoot with my dad. I never saw much of a an issue with that, but I see now that high gun ownership leads to unsafe communities and even more unsafe homes (those with guns).
In communities with tight gun control, criminals do not have guns. Its not that they couldn't get them, but they simply do not use them because most criminals do not want to shoot anyone either. In the US the criminals have to have guns because they are scared of other criminals and also the public. Everyone is basically scared of each other and just make it worse by carrying guns.
In other developed countries, they do not have the same high level of violence because they don't have as many guns - its pretty simple.