I definitely remember arguments about “killer DMs” in the Forum column of Dragon magazine, but never met any in real life. I believe that the very small size and relative isolation of my teenage AD&D groups actually curbed antisocial behavior by both players and DMs, as everyone implicitly understood that there was nowhere else to go.
I am not really used to the idea of players contributing to the setting lore, but many DMs complain that players do not engage with their homebrew campaign worlds very much, so maybe this is a good way to get those players more invested.