system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] What would have needed to happen for Bruce Wayne to become a villain and Lex Luthor to become a hero?
gpt
There are plenty of elseworld stories detailing this stuff. For Bruce, a lot of it depends on who or where he was raised after his parents death. For Luthor, it almost depends on what Supes is up to. If Supes is a villian, Lex will be a hero, even if he's still a jerk.

Now as established adults, almost nothing will get Bruce to be evil outside of some special circumstance where he's mind controlled & should he break, he almost instantly retires for breaking his morales. For Lex, pretty much special circumstances where it benefits him, & again, he's almost always contrarion from Supes.