The copies of his manifesto is corrupted info, I've seen about 4 different versions claiming "uncut" "original" ect. I can't say for sure, but it seems the language pattern changes in his "anti-gun" segments, so my guess is that is added on to further an agenda. Look around for yourself, I'm not saying anymore in fear of being politically incorrect.
Not to get all conspiracy theorist, but it did occur to me that the last few paragraphs had a complete tonal shift. The well though out, clearly stated points in the first few paragraphs turned into incoherent ramblings towards the end. Not sure if it was added later by him or someone else, or if this guy's mental state was spiraling as he wrote the manifesto. Did anyone else notice the complete grammatical and tonal shift in the last paragraphs (I read the manifesto linked by Sabatoa earlier in this thread for clarification)?