Maybe he wants to change the past, not just bring someone back, but change the whole path of how he became evil in the first place. Ever seen Loopers?What if a villain said, I really don’t want to BE a villain anymore, even a reformed one, I want to actually change everything. You might feel no amount of evil you do will matter, because if you succeed, then none of it ever happened.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass