&gt;  is how rare mass shootings are in the United States.<p>Mass killings in the US are very common.<p>If you include:<p>&gt; More than four people shot and killed (not including the perpetrator)<p>&gt; At one time<p>&gt; In one place<p>&gt; By one person<p>&gt; In a public place<p>&gt; Not including gang violence, armed robbery, or domestic violence<p>You get over 70 incidents in 30 years.  That&#x27;s more than 2 a year.  Compare that to the whole of Europe, where you have maybe one per decade.<p>If you change the definition to include at least 4 people shot and injured, but not killed, you get over 250 per year in the US.<p>The US is extraordinarily violent among first world countries, even though violent crime has dropped.