No clue about this dude (Aurora) but I wouldn't be (that) surprised if Breivøk is one. Obviously obsessed, his sense of justice/he felt very wronged and also his methodical approach/years of planning/testing/etc.. Well, I hope not but..
What I really don't get is how the fuck can one willingly cause sooo much suffering to so many people. The victims/injured, family of them, kids, friends, etc.. people that the shooters have never met or know in one way or an other. If one doesn't see (a/o don't care about) the big time grieve their actions bring.. ja, then that someone's a pretty screwed up psychopath also. Clearly.
Hearing/reading about these things never up my mood.. au contraire..