Originally posted by Kris Blaze
Why not?Joker's consciousness is made up of his experiences and memories, all of whom Xavier can completely erase or rearrange.
QFT.
Insanity may be the Joker's shtick, but it's not a power. DC just milks it to make him seem that much more threatening and interesting in a world full of others with actual powers.
A hell-bent Xavier should be more than able to cure the Joker's insanity, assuming there is no actual brain damage.
Xavier ftw, via mindwipe.