I guess it just seemed different when he started going into how much violence he was going to bring against he various departments and how he was going to employ all his training to reek maximum damage. Then he went into rambling about previous presidents and Romney being a sore loser, etc. Then went on about firearms. Seemed to be an antithesis to his entire initial argument.
I might be reading too much into it but it just seemed completely different than the well thought out first paragraphs regarding how he felt wronged by the review committee regarding the excessive use of force charges he levied against another peer.
Maybe at this point of his writing he was just spiraling out of control or spinning him self up so much he wasn't thinking clearly anymore. Or, maybe it's as if Jeffrey says, and it was written by someone else.