But you're also making this point about all signatories being hypocrites because you seemingly have a big bone to pick with the amount of blame Thomas Chatterton Williams portions to each side.
Williams is a public intellectual. What goes on in his mind is of much less importance to public discourse than what he writes.
Let me be clear. I believe that Williams is a hypocrite and I believe that the large majority of the signatories on the harpers letter are hypocrites. I mention him specifically because he was one of the people who actually wrote a lot of its text rather than just signing it, which makes him of particular interest for this discussion.