Many of these lists are not per capita. They ignore that USA has a population roughly half of all Europe (not to mention that it's considerably more diverse in most places).
For example, using the table from a recent The New York Times article, America's Gun Problem of mass shootings (public shootings in which four or more people were killed) from 1998-2019:
Notice that Finland (for example) had 3 where USA had 101. However, Finland population is 1/60th of USA. Adjusting per-capita and this statistic seems to show that mass shootings in Finland are relatively (based on population) 74% more frequent than in USA.
Czech Republic, New Zealand, and Slovakia all work out to around %70 of USA frequency. Some of these countries have less than 40 years of history, allowing for the possibility of further extrapolation.
Wikipedia considers that there were seven major news-worthy mass shootings in Europe last year. (In the same time-span, The Onion reported their headline 4 times.)
(Wikipedia considers that there were four major news-worthy mass shootings in Europe during 2020. The Onion only got to use their headline one time that year. The respective numbers for 2019 were four for Europe and 3 for USA, giving a three year total comparison of 15 (Europe) to 8 (USA). (Trying to draw some equation between the most newsworthy types of shootings.)
Using the frequency of The Onion headline occurrence itself as a guideline, then one would have to say that the USA does not actually experience regular mass shootings, but that they do occur, on average, a few times per year. Between 4 August 2019 and 23 March 2021 (more than 18-month period), the headline only found a single opportunity for invocation. (However, on 4 August 2019, it was used twice!) And before the Buffalo shooting for an entire year, from 26 May 2021 to 16 May 2022, there was no headline from The Onion in that time.)
Some other points for perspective:
The above TNYT article explains:
Most shootings in America never appear in national headlines. The majority of gun deaths in 2021 were suicides. Nearly half were homicides that occurred outside mass shootings; they are more typical acts of violence on streets and in homes (and most involve handguns). Mass shootings were responsible for less than 2 percent of last year’s gun deaths.
That includes suicides which are almost 2/3 of the gun deaths.
A couple other links that examine these questions:
https://www.maciverinstitute.com/2022/05/debunking-every-major-mass-shooting-myth/
https://worldpopulationreview.com/country-rankings/mass-shootings-by-country (Using the map at the top, can be seen that Finland, Switzerland, Slovakia, Czech Republic, France, Norway, Serbia, Albania, Belgium, exceed USA in "per capita mass shooting deaths by 2022" - sources provided there. Of all the countries included on that map, I see only Italy and UK with numbers in that category that are an order of magnitude lower than USA.)
