What is meant by the U.S. government made the same mistakes in Iraq as it did in Iran.? The U.S. has not invaded Iran any time recently.
Just how the weapons became ubiquitous is also not touched on in this summary: Saddam Hussein had an armory. The U.S. forces took that armory. Then they carried on towards Baghdad, towards the major prize and *glory* (cue exciting music). One undefended armory.
One thing that totally stank is that the whole thing was then lost in U.S. party politics. The Republicans lied about having lied and all their supporters started claiming black was white and that the weapons of mass destruction had really existed. We are getting the same kind of crud now from the St Petersburg Propagandazentral with respect to the Ukraine.
Another thing that stank was the sacking of pretty much all Baath party members. Being a party member was a requirement for many kinds of job, sacking all these people created a large pool of disaffected people. This was known at the time but the idiots in charge "knew better". I found it difficult to believe that so much stupidity was not malicious.