20. JLA: TOWER OF BABEL (2000)
Need any more proof that Batman is an unapologetic sociopath? Then look no further than Tower of Babel, a story that reveals that Batman has a collection of files on his computer that describe exactly how to defeat every member of the Justice League. Unfortunately these files get compromised by the eco-terrorist Ra’s Al Ghul, and he soon begins taking down the Earth’s most powerful heroes one-by-one, thanks to Batman's paranoia.
Written by Mark Waid, this story delves deep into the scarred psyche of the Caped Crusader, but it also shows how prepared Batman is for any eventuality, even if it means betraying his team’s trust in the process. Make no mistake about it, the title says it’s a Justice League story, but Tower of Babel is one of the most comprehensive studies of Batman’s personality to ever be released.