It's sad that I first heard this was true when the whole high school shootings were happening. The shooters were "trained" via video games to shoot for the head, one shot, and then move on to the next target, whereas a novice would keep shooting all over multiple times to make sure they got it right. So, it backs up the claim above, and yet, still doesn't make me want to let me kids play video games.
Boy Scouts would teach knife skills and knot-tying — both useful skills for kidnapping and torture — but I doubt you have similar misgivings about that. Making somebody competent at efficiency and rational decision-making under pressure doesn't make them a killer. Video games are not strongly correlated with homicide, that one data point 12 years ago notwithstanding.
(Incidentally, I'm not the downvote. I don't think your logic works here, but it's an interesting correlation.)
