Ask Britain & Europe - mass killings are VERY rare there. Ask Australia - their gun laws after a 1996 mass shooting greatly reduced gun violence: [quote]Results: In the 18 years before the gun law reforms, there were 13 mass shootings in Australia, and none in the 10.5 years afterwards. Declines in firearm-related deaths before the law reforms accelerated after the reforms for total firearm deaths (p=0.04), firearm suicides (p=0.007) and firearm homicides (p=0.15), but not for the smallest category of unintentional firearm deaths, which increased. No evidence of substitution effect for suicides or homicides was observed. The rates per 100 000 of total firearm deaths, firearm homicides and firearm suicides all at least doubled their existing rates of decline after the revised gun laws.[/quote] https://injuryprevention.bmj.com/content/12/6/365
Meanwhile, mass shootings are on the rise in the US, although the pandemic put a damper on them: This map of US mass shootings is 10 years out of date, but it gives us some sense of how wide the problem is and what weapons are used
