CBR lists 10 decisions made by Justice League members that they still regret.
https://www.cbr.com/justice-league-w...sion-of-bialya
10. Zatanna Mind Wiping Fellow Leaguers - Identity Crisis
09. Batman's OMAC Project - The OMAC Project
08. Superman Becoming A Tyrannical Overlord - Injustice
07. Wonder Woman Killing Maxwell Lord - The OMAC Project
06. Batman's Contingency Plans - Tower Of Babel
05. Superman Abandoning The Justice League - Kingdom Come
04. The Flash Altering The Timeline - Flashpoint
03. The Catalysts Of The Original Crisis - Infinite Crisis
02. The Invasion Of Bialya - Extreme Justice
01. Green Lantern Corrupted - Zero Hour: Crisis In Time