User blog comment:Bato of the Heavy Iron Rock Hammer/Erza's Father's fighting ability?/@comment-31119762-20170214172844

Well don't forget Acnologia basically murdered all the dragons. I don't believe it was stated he murdered humans. He has actually great common sense with his goals. He currently is after the remaining 7 dragon slayers (9 previous with God Serena and Irene dead) so he had no reason to kill humans who partook. Besides that he was just some lowly general.