You included?
You fall for the "former marine" business, like that precludes him from being a nut. In fact, this is an important point to understand why he turned.
He was upset with the way inspections were going. I found him persuasive in this regard. But so what? That was 1998 - why did he do a 180 on whether Saddam had MWD or not? The two are not logically dependent on each other.
The whole "spying" thing is nonsense - pretextual agitprop created by Saddam's people to interfere with inspections. Of course they were trying to make a case against Saddam - isn't it obvious he was hiding something? And assume there was "spying." What would that fact have to do with the fact that Ritter did a 180 on the existence of MWD and Saddam's capacity (not to mention will) to increase that capacity? Answer = nothing.
All Saddam's smoke and mirrors. It's a joke anyway that a team of inspectors could find everything in a country the size of Texas.