User blog comment:Miskos3/Fairy Tail Chapter 506: The Broken Bond, Review/@comment-23887466-20161017143817/@comment-211.25.127.218-20161019023724

Morally corrupted to the point where he became an idiot? Yeah he shouldn't be able to fight Natsu then. After all he can't think rationally anymore, he shouldn't be able to fight rationally too.

Let's just face it, Gray just wants to blame someone on Juvia's "death" to push his sense of guilt aside, so he opted to blame Natsu instead. He even link Juvia's "death" to Natsu for God sake.

So no, this isn't an issue of Gray being morally corrupted, it's simply the fact Gray trying to push the blame of his past mistakes on someone.