Considering how many WMDs 'intelligence' reports said Saddam had, you'd think they would have found them by now don't you? How can you disarm when you don't have anything to disarm?
I think it's specious to believe he had nothing to disarm. I rather suspect we're going to find out, in time, exactly what happened to the WMD. My guess is they went to Syria, or were secreted within Iraq and only a very few people know (knew) where.
Don't forget, he booted the UN in 1998 when they uncovered WMD.
It is (was) there.
Finding actual WMD is a moot point. Saddam's done.