I'm more worried that the Justice Alito is apparently unaware of the phenomenon of vaporware:
There are games in which a player can take on the
identity and reenact the killings carried out by
the perpetrators of the murders at Columbine High
School and Virginia Tech.
But both the news article and the now defunct website he cites clearly state that the game doesn't exist.
There was at least one (probably more) paltry DOOM map mods depicting Columbine High School. Not finished products, very poorly done, but enough to fulfill Alito's claim.
In the spirit of the reference, there was a high-quality simulation of the JFK assassination, with the user acting as Oswald. Made a big splash of outrage in the news and was soon pulled (the contest to reenact "the shot" didn't help). It's still available if you look.
BUT...keep in mind endless movies & books depicting gratuitous violence. Alito hasn't articulated a difference on "freedom of speech" grounds.
http://newsfeed.time.com/2011/04/20/school-shooter-video-gam...