User blog comment:- Darkchylde/Acnologia's Element?/@comment-173.87.12.242-20141211055642/@comment-7418318-20141211102406

@Anon: Yes he is. He didn't just slaughter hostile Dragons, but also the Dragons that were defending Mankind against the "evil" Dragons, who were his teachers and allies.

And then he proceeded to kill or at least maim pretty much anyone who got too close to him (like Gildarts) without provocation.

And last but not least, if not for Mavis' intervention, he'd have killed the entire Tenrou Team for no apparent reason. But he didn't just go right ahead to kill them, but had some fun tormenting them first.

His family being killed wouldn't be justification for the indiscriminate slaugther he did either and there were plenty of hostile Dragons for him to slay to gain power back then without him having to turn on his allied Dragons and commit genocide.

I think we can savely say he really is that bad at the moment, no matter what he might once have been.