Eventually, due to the negativity, TSR made changes to the game. James Ward, an executive at TSR had demons and devils removed from the Monster Manual and Assassins and some spells removed from the Player's Handbook. Ward explained his actions in an article in Dragon, a magazine about fantasy role-playing games, saying that "Avoiding the Angry Mother Syndrome has become a good, basic guideline, for all of the designers and editors at TSR, Inc.". In later editions TSR re-added some of the removed features in a separate manual intended for mature readers. (From 5e monster manual)