I don't know. That's the point: a lot of us, including the article's author, are attributing causes to the amount of spree shootings along to the amount of dea

I don't know. That's the point: a lot of us, including the article's author, are attributing causes to the amount of spree shootings along to the amount of deaths caused by firearms in general to several individual phenomena but there's almost no way of controlling for a myriad of other factors in play, which include very diverse things like culture, political climate and demographics.