8. His Fans Killed Robin
Comic fans are supposed to root for their favourite characters, but a clear distaste for then Robin Jason Todd would lead to them voting for him to be killed off when given the chance to decide his fate. What the 5,343 who decided that Robin should be killed by The Joker were doing was effectively voting for Batman to lose, a pretty poor way to treat the hero. As a result, he was effectively responsible for allowing a child to die, but those bloodthirsty voters got their comeuppance when Todd returned in the most convoluted way possible!