I'm a little bit confused by that source to be honest. It is supposedly about mass public shootings, and then lists two attacks in Switzerland - one of which was a domestic affair. A tragedy yes, but not a public shooting.
In then goes on to list of total of 25 attacks in the US during the period 2009-15. Whereas
Wiki suggests 23 attacks with at least 4 victims in 2022 alone.
I mean obviously I don't know the context of the attacks and whatever, but re-reading their definition as "Mass public shootings – defined as four or more people killed in a public place, and not in the course of committing another crime, and not involving struggles over sovereignty." I can't help but think there is - to put it the most kindly - more than a little bit of cherry picking going on here. That and some straight out instances of not actually comparing like to like.
