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 school massacre , as well as the Virginia Tech massacre and that Valve had until 5:00 PM on March 18 to remove the mod
Erfurt school massacre
Erfurt school massacre
Jack Thompson (activist)