It was really just an alternate version of Superman where his mind became corrupted as did many people in Batman's alternate future. Even a god-like being like Superman can be influenced by the species he shares planet Earth with, not out of fear, but a deep seated sense to belong as he is a social creature at the end of the day. Perhaps in that timeline he found purpose.
Batman and Superman are two different people, and even if they are both essentially good, they are different, and they will not see eye to eye on everything.
I liked that alternate version, it was interesting.
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