A must-read. Glenn reminds me that it was the anthrax attacks that took the post-9/11 sense of threat to a whole new level - and moved the Iraq invasion forward as a possible response. That we now think the threat was actually a domestic source with no connection with Islamism is a critical piece of historical adjustment. The case is not definitively made, of course. But it's very striking.
The central question of the time - how much danger are we actually in? - becomes harder and harder to discern. With torture as the Bush administration's core weapon in the war on terror, we will now probably never know anything for sure.