He's a very interesting guy. Insane, even if not in psychiatric terms. Completely off his head barmy. But his mind still holds together enough to do such a thing, and believe it's the right thing to do! I suggest reading his manifesto, especially the diary part. It's so odd to read sentences side by side, the first being a description of trying to secure explosives, and the next being something like 'I played World of Warcraft, lol :-)' (not a direct quote, but near enough tbh).
So bizarre. I would love to have a conversation with this guy. His mind has just gone off in some insane direction, and if anyone could say why, we'd all be much the wiser.