Good point. But there's a difference. Our troops have scoured residential neighborhoods, gaining access to any basement. Has there been one inspection of a mosque? Seems to me if I were an evil dictator, I'd hide the material in a place where the infidel could not tread.
I'd imagine that we've indeed looked in quite a few basements in residential neighborhoods, but is it possible in the relatively short time we've been there to have searched even close to all of them? I doubt it. Iraq is about the size of California with nearly the same population. That's a lot of basements.