Connecticut’s Office of the Child Advocate recently released a report concerning its investigation into Newtown shooter Adam Lanza’s medical and school histories, detailing “how his ‘progressive deterioration’ might have been significantly eased if recommended programs of treatment had been followed by [his] family.” Furthermore, said the study, Lanza was acquainted with firearms from a young age. It also noted that severe mental illness is roughly stable worldwide, while gun violence varies from country to country.

“The conclusion that access to guns drives shooting episodes far more than the presence of mental illness is inescapable. Those countries that have tight gun controls in general experience less overall gun violence and have fewer episodes per capita of mass shootings.”

Read more at The New York Times.