10 Times Batman Went Too Far
7. Cataloged The Justice League's Weaknesses - Justice League: The Tower Of Babel
The Justice League are - indisputably - the strongest world power that has ever existed in the DC universe. They're made up of the strongest superheroes from around the world, can basically go wherever they want, and if you have a problem with this, we advise you to speak to the league's attorney... which is also their nickname for Superman's heat vision.
Obviously something has to be done to keep them in check if you want to avoid the Injustice universe. Which is exactly the reason why Batman came up with the project to catalog the weaknesses of every member of the Justice League just in case.
As you can imagine with a sword of Damocles setup like that, those files inevitably get stolen because I guess the world's greatest detective isn't great at file encryption. Every member of the league very nearly dies from the ensuing chaos caused by Ra's al Ghul stealing Batman's secret files on his friends and coworkers.
This moment is so low on the list because it isn't like Batman doesn't have good, AMPLE reasons to fear an out of control Justice League. But maybe next time you should get a filing cabinet with a stronger lock, Bruce.