In March 2011, in response to the creation of a school shooter mod entitled "", developed by Checkerboarded Studios on Valve'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 school massacre, as well as the Virginia Tech massacre and that Valve had until 5:00 PM on March 18 to remove the mod.