User blog comment:IamJakuhoRaikoben/Chapter 415: And It Shall Become Your Will To Live, Review./@comment-7418318-20150112233703

Yesterday I had a funny idea before falling asleep.

Imagine if Acnologia had a mate, a female Dragon Slayer who underwent the same transformation as him and they have a few children.

Zeref, his strongest Demons and the surviving Dragons are the only ones with the power to hurt him or his family, so he's launching pre-emptive attacks to wipe out anyone who's capable of harming them. And the comment about wanting destruction... maybe he's not good with words and meant or didn't finish the sentence that should have been "Destruction! Destruction of everything that could hurt my family!".

If we spin the idea further, maybe he only went nuts and wiped out most of mankind in F-Rogue's timeline because something or the other killed his family, driving him mad.

It's just one of those (almost) impossible stupid ideas I sometimes have, but I thought I'd share it anyway.