When I read his email, my thought was that the email was a great image-building propaganda tool and that he wrote it with the knowledge that the email would be made public.
His email talks how great he is, how he loves entrepreneurs and how other investors are in it for self-serving factors like ego and money. Of course, I have no way of knowing whether that is true or not. However, I'm willing to bet that many unscrupulous investors could easily write a similar email.