The repetition is obviously intentional (I'm surprised this wasn't evident to you). It's written more as a speech rather then a pamphlet. Have you listened to for instance Obama, or any other politician? Usually they have very little to say(you could probably summarize in 5 sentences), but to get the point across they use repetition. It's an effective communication tool.
He is using email, of all means of communication... far from effective and one of the narrowest communication channels. We are far from "effective" here - he was just venting his anger.
