User blog comment:FairyRaven/Fairy Tail Chapter 363: The Stories That Demons Read, Review and Commentary/@comment-7418318-20131206122143/@comment-7418318-20131206134151

Well... siting in an isolation cell in prison isn't exactly the best way of resocialising someone.

What I find more glaring than the whole good-evil thing is the lack of motive for Cobra. How is throwing the world into chaos going to help him find Cubellios? He said that finding his friend and hearing his/her voice was his only goal and yet he helps a cause that would make this task even harder?

For Angel on the other hand it could be explained. With the way Happy was turned into a dog for example, there is the possibility that the infinity castle could actually turn her into an angel (or make it appear like that anyway). Still not exactly what I'd call a good explenation, but with Angel's state of mind (she was begging Gray to kill her, so she could go to heaven at one point) maybe enough to convince the little lunatic.

Actually Angel was one of the things of the arc that I found well done. She's just so badly traumatized by what happened to her in the Tower of Heaven that she just fled into a dream world and tried to become and angel. And she's so cruel because that's the only way of life she ever experienced, which is further supported by what she said about the "sin of being born Human". And being defeated by Lucy - a mere Human - she's pushed even further into her delusions.