Doive1231... You really are a moron. He wasn't influenced by the game. Quite the opposite... His desire to do harm made the game something that it's not intended to be... a murder simulator. He used it in a fashion which the game's creators never envisioned or intended. The same way he turned a firearm into a device for killing innocents versus a method of self-protection. I really don't care how you try to spin it, but with the wrong intentions almost anything can be used for evil. No, you couldn't use a vehicle, kitchen knife or a brick to kill 86 people in such a short period of time, but they can (and have) been used to kill others. Should we ban all vehicles? Should we ban all sharp or blunt objects? By your logic (or lack thereof), yes.
Just for full disclosure: I own modern, high-res FPS games as well as firearms. I have never had the desire to use either for harm. I also have a crowbar, which I may send to Doive1231 so he can pry his head out of his ass.