User blog comment:SilenceInTheLibrary/Annie's Future/@comment-9096809-20130822000140/@comment-2214433-20130912121423

Well, we still don't know anything about their motives and their missions. We can speculate all we want, trying to make excuses for their murders, but till we find out the exact reason, we cannot really 'categorize' them.

Hell, even then it may not be possible. I like that even though they are considered antagonists now, they may even end up being those doing things for 'greater good'. It's not exactly black and white with characters in this series. Look at Erwin :P