What I've heard is, those bunker complexes had been compromised by the US bombing campaign prior to the invasion, making it dangerous to enter them and dispose of the contents. Sounds fishy to me; don't we have chem suits? Even so, I doubt the troglodytes have qualms about sending people into contaminated bunkers to retrieve chem weapons.
Well, ok then.
If we left them there and assumed no one would bother with them, that’s on us.
Stupid.