I have seen first hand what damage D&D can wreck on unsuspecting kids.
All-of-a-sudden they get confused. They hear you talk of a game and yet there is no screen to see the game. Then they talk about some RPG games for a computer or console and don't understand how you can do something better with pen, paper and dice.
You begin by describing an alien world that exists only in the mind with a user interface that looks very different to facebook. At this point most compeltely give up...but some are susceptible to imagination and abstract thought and begin to imagine.
Before you know it they start blaspheming and talking about "gods" and pretending to be characters with divine-like powers that do away with rulers or anyone they do not like. Stealing, brutal executions, piracy, killing make-believe flying lizards for this thing they keep chanting like crazed monks "loot".
Piece by piece these kids become attached to their characters, and their character's flying horses or wands of wonder (which only makes sense if you're on crack; possibly a gateway drug) and the inevitable happens. That DM guy explain how something that makes no sense makes sense and your character dies, or you have the easiest battle except all your rolls are utter shit and that fucker DM keeps rolling 18, 19 and 20 and well your character dies because of that DM. (It's always him, he sets the penalties, sets the encounters, the monster actions, even the dice choice to randomly select who gets attacked and then the dice choice to randomly select how many attacks and even the damage, all that asshat's fault) and well...then your character is dead.
When little Timmy's character dies you know this game is evil. He was already socially rejected, isolated, alone, possibly with acne and braces...but when that character dies Timmy seriously loses his shit in the worst way.
Crying, anger, death threats, promises to succumb to the dark side and what not. It's ugly.
All I can say Timmy is that when you chet your DM on the dice roles one day he finds out. One day your level 16 expert theif slips during climbing and rolls downhill being unable to break the fall. He falls, hitting extremely sharp rocks on the way down following the natural curve in the mountain side he falls down a creek (yes on that unexplored side of the mountain and no it's not a creek that;s on the map cause it's too fucking small) and because of momentum he reaches the waterfall...AND FALLS...falling down and hitting some more rockas on the cascading waterfall he struggles to breathe as the current takes him...and washing him down another 8 fucking waterfalls. Yes, with very sharp rocks.
Then the very thing that caused your expert climber thief to fall becomes apparent when he finally grabs on to some bush as he gasps for air being mortally wounded and bleeding but just in the real of the living. A loud, low rumble of the impending earthquake that sees half the mountain side come crashing down on you. CRASHING DOWN ON YOU TIMMY! FOLLOWED BY LIGHTNING BOLTS AND METEORS THAT HIT TAHT SMAE SPOT WHERE YOU ARE BECAUSE ALL YOUR MAGICAL ITEMS HAVE CREATED A POSITIVE CHARGE SO STRONG THAT THE AIR CANNOT ISOLATE YOU FROM THE NEGATIVE CHARGE INTHE ATMOISPHERE AND WHE NTHAT SHIT GETS ELECTRIFIED IT CAUSES A HORRENDOUS WAND OF WONDER MAGNETIC ATTRACTION TO NEAR FAERUN ASTEROIDS. YOU'RE DEAD. A SPLATTER CRISP OF A CINDER DEAD. BEYOND RESURRECTION AS THERE IS NOTHING TO RESSURECT. THE SMASHING AND ELECTROCUTION OF ALL YOUR MAGICAL GREAT CREATES A RIFT THAT SUCKS THAT PORTION AND WHATEVER REMAINS THERE ARE INTO THE NEGATIVE ELEMNTAL PLANE. THAT SORTA DEAD DEAD.
Sure that might be hard to imagine but just look what happen to Hitler when his character died; https://www.youtube.com/watch?...
So is D&D dangerous? -you decide. Just a word of advice, don't do the thing your DM hates the most and then keep it a secret and then amke it an inside joke in the group cause that DM might get very angry for having crafted numerous adventures for many hours for the sole enjoyment of his players until someone started getting ridiculously lucky too many times and then the truth got out.
...and Tim, if you're reading this; your characters family (and that fucking horse) have all been taken into slavery to pay off debts. Hard labour.