Honestly, it looks like a well thought out letter to me. And considering that it wasn't an attention ploy, because he really did check out, I really doubt he was trying to make her feel bad. Why would he care? When you know you're going to be dead shortly, petty things like that don't come into play. (I would hope).
I don't know... to me it's like, the dude was obviously sincere. He followed through. I know my last letter to the world wouldn't be something lame just to make someone feel bad.
