Is Snopes biased? I'm asking because the article seems fair to me. It explains their methodology and explains Lott's definition of a mass shooting, his methodology, and why it's (in)correct statistically.
I think looking at the deaths caused by mass shootings shows a better picture. The US has mass shootings every year. The European countries in the CPRC's data only had 1-2 years in which mass shootings occurred. These shootings resulted in a lot of deaths, but they seem to be one-off incidents. In the US we have a problem with more people thinking it's okay to shoot others due to their own mental health problems.