"Looters took off with all that right under the nose of the US?"
Excuse me...the US was only there for a couple weeks, and as others pointed out when this arose several months ago, they may have even been looted before we arrived. The bigger question is, why didn't the UN dispose of these materials as they were there for several years?
If I recall, many of these materials were only secured by wire-locks, which could've easily been broken and replaced. Not to mention that many of these facilities had secondary entrances from were these materials could have been looted. This is nothing but an attempt to shift the blame from were it really belongs: The UN.