It wasn't in the UN mandate to order such explosives destroyed, Crimson, plain and simple. Had Iraqis shown the UN inspectors that such would have been used for some purpose other than nukes, they would have been allowed to do so. Unlike some, the UN was playing by the rules.
The whole affair illustrates at least two important points. First off, the Admin set off on this adventure undermanned and underplanned, and have done their dead level best to obfuscate that fact. The guys of the 101 would have had a grand old time blowing those storage facilities sky high, if that had been their orders... or would have secured the facility, if that had been their orders.
The crowning glory to it all is the claim that the Russians took 'em, to Syria... Yeh, that's it... If you're gonna tell a lie, tell a whopper, something so transparently lame that they'll figure you couldn't possibly have just made it up to cover your ass... you couldn't be that stupid...