My apologies, but maybe I am just getting old and remember D&D dust up too well
When I was a teen my high school history teacher burned my dungeons and dragons books (me and others were camping out on his property and he was a Christian Fundie).
There was a craze back then - see the 60 minutes documentary (on youtube) and the movie Mazes and Monsters (starring a young Tom Hanks) - where people were blaming role playing games for many ills.
Kids killing themselves or others were blamed on the game. It was a tool of the devil.
Were there a few who maybe used the game in ways not intended? Sure. Didn't know any myself but I am guessing maybe that there were some who had issues and 'got too involved' in it.
I remember that time well (not just for the reasons above). I was looking at getting a cool cloak (based on the LOTR) and my dad (a christian fundie) got upset and said no way could I buy one because he was afraid I would become like those other kids (he watched the 60 minutes show) that were drawn into the game and did terrible things.
Guns. Video Games. Movies. These are not the causes of things we see going on at times.
The person who did this latest act was not motivated by any of those things. They had free will and used it for reasons that we don't really know at this point.
To start blaming such things is to remove the real causes and empower things which don't really have any power at all. It is a way, perhaps, for some to try and make sense of it all. But it is not based on truth.
It is a way, used by many I have seen in the past, to make sense of something which makes no sense. People trying to tell themselves that if they can isolate what they see as a cause they can save us all from the same thing happening again.
It is lying to yourself and to others. An attempt to control what you cannot.
Problem here is not the guns, the games, computers, etc - the problem we face is trying to make sense of what some psycho did. And you can't do that fully.
You cannot, no matter how much you want to, control others and gain a perfect and safe society. And you sure as hell cannot achieve that by looking at that person and trying to remove from the rest of us the tools they had or the things they did for pleasure and hoping that will fix it all for you and make it all better.
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It really isn't a matter of opinion; we have become a more peaceful people. If this were redrawn as a rate per-capita it would be even more clear, as we have many more people and much less violent crime.
Down markedly since 1993.
As the popularity of D&D and other role-playing games increased, Pulling's more extreme views and statements were increasingly called into question. For example, she once told a newspaper reporter that eight percent of the people living in Richmond, Virginia were Satanists. She had arrived at that figure, she explained, by estimating four percent of adults and four percent of teens to be involved with Satanism, and adding them to get eight percent. When the reporter informed her that mathematically that was four percent, not eight percent, she claimed that it did not matter because even eight percent was a "conservative" figure.[7]
My son and his friends (20 year olds) all play a few times a week. Magic cards have also made a comeback.
I was very happily surprised 
Plus, it's open source, so it's free. But there's a huge repository of info on it. Regardless, you're likely not to come out of the dungeons of doom alive.
I recommend a look see. Don't let the simplistic visual characterizations turn you off. It is a very complex and ever intriguing universe.
Sorry, that's not NetHack, that's the original hack and slash adventure game, coded on a DEC PDP-10. I played that game so many times that I had the entire thing memorized. Even decades later I could probably do a credible job at beating it.
But NetHack is evil. You can only win -- I've done it -- by being ruthless and knowing what to do when the going gets very, very tough (as it is want to do).
It is the most difficult D&D type game I've ever played. It takes weeks to play a single game, assuming you survive.
Even real, roll-the-dice, D&D isn't as challenging. I love NetHack. And D&D.
Being into RPGs myself, I remember very much people going apeshit over D&D, calling us satanic, putting up a giant wall of stupid.
Again, I'll say it. And people don't like me saying it, because they think I'm "disrespectful" in the wake of a tragedy.
When people are hit with these tragedies, they become stupid, and they become authoritarian. It is exactly at times like RIGHT FUCKING NOW when we need to be watching out for opportunist authoritarian asshole types who want to hit us with stupid little authoritarian restrictions, or worse, stupid BIG authoritarian insanities (like throwing Japanese-Americans into camps after Pearl Harbor, or our decade of war, authoritarianism, destroyed civil rights and paranoia after 9/11.
Already, AMC has had a dumbass attack and banned costumes in their theaters.
grandmother (on my mother's side, a real nut case) hid it and then destroyed it. 
I guess she thought it was evil or something 
To this day it infuriates me because it was a treasured book of my aunt's. My aunt gave it to me because I loved it and was so interested in it. I wish I had that book! 
and old when it was given to me, probably printed in the 1920s or 30's. I feel it was taken from me for a ridiculous reason. I'm glad you still have yours to treasure though.
