I find it quite interesting how he rationalizes this behavior. Although I don't have the time to read his entire manifesto, I've skimmed through it a bit. He doesn't even see himself as awful, he sees himself as a hero, one to lay vengeance on another race for what they did to another race 600 years ago. In his 8chan post, he talks about how he hopes memes will be made about him. For those to share his postings.
The fact it's so linked to 4ch/8ch culture is awful in its own right, but it makes me curious on how that type of shitposting legitimately affects unstable individuals. While I'm sure many are on these types of sites for the meme, most are 13 to 24 young men, and some people who believe such rhetoric, but would never kill, and the minority who are like this person. Unstable, impressionable, and the mentally deranged.
-Edit- Sorry if anything I've stated has already been posted. Thread is moving a bit too fast.
Hush. You aren't cool because you're desensitized to death. Go outside.