I said this recently on a different thread, but the Sandy Hook shooter left half empty mags scattered around the school.
To me that is indicative of a video game player, because in most first person shooters(speaking from experience here) when ever you reload, your ammo is magically consolidated into nice full mags. A lot of times you do that in between bits of fighting in game so to ensure a full mag.
Side note: My platoon sergeant was most emphatic that this was a great way to wind up with a bunch of half full mags at a bad time.
That being said, I don't think the fact that the Sandy Hook shooter logged hours of video game time means a damn thing in regards to his actions.
He was clearly deranged. As was Charles Witman, who most decidedly did not have any violent video games to set him off.
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"Had King Kong showed up in Texas, Frank Hamer would have taken him down with his Model 8 in .35 Remington...well, he was kind of big, so maybe his BAR"