Board Thread:Questions and Answers/@comment-24198975-20131121204608/@comment-1639863-20131129001116

Not everything has a complete mirrored counterpart. The best example to explain it that I can think of is Injustice: Gods Among Us. Most of the basic stuff is the same (Bruce's parents killed, Superman from Krypton) but one little event can change a whole lot around it.

It's not a matter of "Earth 3 is evil because it's an evil place." It's more, "something went wrong in this reality that screwed everyone up into evil monsters." This isn't an evil mirror, it's a tainted reality so to speak.