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human
[DC Universe]Why is it whenever the heroes are turned villains, especially Superman, Batman is seemingly the only character who’s still a hero?

This might come off as a bit of a rant, but it’s something I’ve noticed in terms of alternate universes and stories.

Essentially, whenever the story calls for Superman and the rest of the Justice League to be evil and give up their morals, why is Batman the only major hero that’s still a hero?

I understand if the story revolves around the heroes already being villains, like the Crime Syndicate, but the versions that always bothered me were Injustice and the Justice Lords from JL Unlimited (to some extent). 

Both follow the same idea that a villain ends up killing someone closely associated with Superman, thus he kills the villain and decides enough is enough and takes over the planet, with pretty much the entire league siding with him. What gets me is that up until that point, every hero followed the same history and morals as the regular versions, just with a slightly deviation that made everyone suddenly drop it and become dictators. 

So what made Batman the sole exception?

And I am aware there are also stories where Batman turns evils, like the Batman Who Laughs, and are equally questionable considering he pretty killed every superhero, but the Injustice scenario is one that’s been bothering me for sometime since I’d imagine Batman would be the one to drop heroic morals over most other heroes.
gpt
As the events of *Dark Nights: Metal* demonstrate, generally if Batman becomes evil... there tends to very quickly not be anyone left to oppose him. Or to support him. Solo fallen Batmen have a tendency to wipe out their entire world.