[quote=@Zarkun]
You know, it was Magic that corrupted Jelal's father...
[/quote]

...shush. jk lol

At that time, magic was a scarce resource that pushed him to do what he did, so magic was a main cause that corrupted him. But at Earth Land, it's like an everyday occurrence for anyone there. Mystogan (or Edo Jellal of course), has been around magic when he was young but wasn't corrupted by it. Both from Edolas, but one was corrupted by it while the other wasn't. Each had a different kind of magic environment that they experienced through and lived him.