The Jedi didn't wipe Revans mind, it was damaged in the attack by Malak. The Jedi had 2 choices, give Revan a new mind or let him die.
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Or they could have given him back his old mind That also was an option. True his mind was damaged but if they revived him his mind would still be intact.
Plus it is said that the Jedi did wipe Revan's mind, the Jedi say it and so does Malak and even Carth.
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And Bastila says Revans mind was to badly damaged to be restored.