In March 2011, in response to the creation of a school shooter mod entitled School Shooter: North American Tour 2012, developed by Checkerboarded Studios on Valve Corporation's Source engine, Thompson emailed Valve's managing director, Gabe Newell, demanding that the mod be removed, as he speculated that Valve played a part in the mod's development. In the letter, Thompson stated that Half-Life was directly responsible for the Erfurt massacre, as well as the Virginia Tech massacre and that Valve had until 5:00 PM on March 18 to remove the mod.