Putting Saddam out of business also put allot of weapons manufacturers from other countries in dire financial condition.
Blowing up those caches is like blowing up the evidence. Were they legal or illegal purchases under the UN embargoes? If illegal, who manufactured them and who sold them to Saddam?
Good questions. Hopefully, more of the story will come out.
The U.S. should already know where the weapons are coming from.
And if we don't know by now, we'll never know.