I have always laughed at the prospect that it was dangerous. There have been people who had killed because of it, or killed themselves because their character died. But there have also been people who killed themselves or others because of a movie, a song, or because they thought God told them to do it. So what I'm saying is, if somebody is that kind of person, you can't blame D&D, or the song, the movie, and especially not God. They're just messed up people, and there were some like that since way before TV, radio or D&D.
I used to think it was a joke when you'd see those little religious pamphlets condemning D&D as a bad influence showing badasses in leather jackets kicking people's asses, cutting them with knives, and conjuring the devil and playing D&D. No, it was the GEEKS and nerds and guys who got beat up by those types who played it. The mean ones never played it, it was for geeks!
My brother and all his friends were teen D&D geeks in the 80's. They played it until they were in their mid 20's and still do occasionally for fun. They were all computer geeks and they grew up to be computer geeks making lots of money. I thought it was funny because on the I Love the 80's special, somebody said what happened to all the D&D geeks, did they turn weird, get in trouble? No, the guy said, they're all computer experts making big bucks. For the most part that's true.
One of my brother's friends is still addicted to an online version of it and he can't hold a job or a relationship because of it. He won't go to work or sleep more than an hour at a time because he's afraid his character will die if he leaves it too long. He literally sleeps in a chair at the computer. He now is living with his parents again and is out of work at this time.