It's still blamed for most bad things that happen
Whenever something awful goes down, no matter if it's a shooting spree or a terrorist act, a suicide or bullying, the first thing that investigators usually do is check the assailant's hard drive to see if that sick, twisted fuck played any Doom. The investigation goes something like this: "He loved Doom. Case closed, folks."
The truth is that, like Tetris, everyone plays Doom at some point in their life. Doom has been so ubiquitous for so many years that you practically have to have been locked in Kimmy Schmidt's bunker not to inadvertently wind up with a copy of Doom on your hard drive.
The Columbine shooters, Harris and Klebold, who killed 12 students and one teacher before committing suicide in 1999, supposedly rehearsed their attack by playing Doom. Some Columbine victims even sued ID Software and GT Interactive (Doom's publisher), but they were ultimately unsuccessful.