yes, most of these people are simply killers and not trained shooters.And yet 4/5 on this list were done with semi-automatic rifles
The Deadliest Mass Shootings In History
The US is known for being a hotbed for mass shootings, but some of the worst killings have actually taken place elsewhere in Africa, South Asia, and Europe.www.worldatlas.com
The only reason pistols appear in mass shootings (4+ victims) is because they are in the possession of nearly 3/4 of all gun owners.
being popular doesn't make you right, although no one expects you to get that.