“The data come from USA Today, Northeastern University, and the Associated Press, which tracked mass murders in which four or more people (excluding the killer) were killed in a 24-hour period.”
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“Needless to say, murders of any kind are tragic. But the database challenges the conventional wisdom about mass murders, showing that their frequency has held relatively steady since 2006.
In 2006, there were 38 mass killings—the second highest number in the database. The year with the highest number was 2019, with 45 incidents (including 8 public shootings, 25 non-public shootings, and 12 non-shooting incidents). In 2008, there were 36 mass killings and 35 in 2021. On the lower end, there were 22 mass killings in 2012; there were 25 each in 2013, 2014, and 2018; and there were 26 in 2007. There have been 19 incidents so far in 2022.”
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“”A guy who kills his wife and children and sometimes kills himself is the most common type of mass killing,” Fox told USA Today. “Mass killings take place far more often in private homes than in schools, markets or churches.””
https://reason.com/2022/08/22/number-of-american-mass-murders-relatively-steady-since-2006/