Totally right as regards the private mail. However, the fact that he is homeless has nothing to do with the discussion. It just adds some "feeling" to the problem which should not be there. A MacArthur fellow (1990) is supposed to be able to manage his life (or get someone to do so).
That's something that can make normal people kill themseleves at the worst, or throw them into a pretty bad emotional turmoil with some very real effects on their life.
Intelligence has nothing to do with this.