system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Aside from Identity Crisis, what would you consider Batman's biggest blunder as a detective?

Obviously in Identity Crisis, without spoilers, he should have figured out the initially believed cause of death was wrong. But I can ignore that by saying it's proof he works better alone.

Outside of that, when has he been wrong? When has anyone out smarted or out lucked Batman as a detective?
gpt
In Tower of Babel, Ras al Ghul uses each League members weaknesses against them.  Turns out he stole the information from Batman's files.  Batman himself is distracted by the theft of his parents corpses.  It causes long term trust issues that Batman had ways to defeat the League but also allowed them to be stolen.

The story is the basis of JL: Doom but with Vandal Savage as the main villain.