12 People Shot at Mother's Day Parade in New Orleans.

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Dunno if Americans are vastly psychologically/culturally different, but since strict gun control was introduced here in Australia in 1996, (including a ban on semi-auto rifles and shotguns, and restrictive ownership and licensing rules) we haven't had a single mass shooting. Not one, in 17 years. (In the 18 years before the legislation, we had 13 mass shootings, about one every 15 months)