User blog comment:FairyRaven/Fairy Tail Chapter 413: Book of E.N.D., Review and Commentary/@comment-83.253.84.32-20141222153117

I think that when we learn more about Acnologia and his backstory we will learn that he wans to do more than just destroy. He probably got more of a goal an motives for why he does what he does that we will learn about later.