"What we know now about Iraq's weapons programs would have been utterly impossible to find out without having invaded the country. There is no way on Earth even the most thorough inspection process permitted by Saddam would have come up with the information we have now."

I don't agree. We could have got to this point or even to a more complete information, if Saddam had decided to fully cooperate with UN inspectors. But Saddam simply wasn't man enough- he was just a thug who had mad dreams of being some "great leader".
Fully cooperating with UN inspectors and complying with rest of cease fire agreement would have require that he accept that he had lost the war, and that he wasn't going to be leader seen by the world and history as a great king which ruled a large Arab empire.
Saddam started life as a poor child in an abusive environment, and he went through life to end up being poor man who abused many. The boy remained sort of retarded- never mentally/spiritually going anywhere.