It is?

[Not that she doesn't think Wu is mentally strong, it's just... she hadn't thought it was his particular forte or anything.]

I haven't the slightest idea what my blood is supposed to do for me. ...It just made me very paranoid all this month.

But... yes, corruption appears to be their word for describing a kind of insanity. People here seem to lose their mental fortitude much more frequently - it can manifest in many different ways, but basically... any strong mental blow can push people over the edge easily.