How Stupid Was Donald Rumsfeld?

I was watching The Newshour the other night and they were doing a piece about the total cost of the war in Iraq. They had economic experts on who were crunching numbers and making estimates and they came up with the figure of about 3 trillion dollars before it is all over. This figure does not even include the interest on the money that we are borrowing in order to finance the war which is the first time in history that we as a country have ever done that. One of the most interesting moments in the piece came when they briefly ran an interview with Rumsfeld form January 2003 which was two months before the war started. I think it was from "This Week with George Stepanopolous." He asked Rumsfeld how much did he think the total cost of the war was going to be. He throws out the figure "somewhere in the neighborhood of about 50 billion dollars." The host then comes in and says "well some economists are putting the figure at closer to 300 billion." Rumsfeld blows it off and says "bologna."
I swear to God and i am actually asking this seriously. Was that idiot ever right about anything he ever said or did? Before the war started the general in charge of the invasion Tommy Franks was fighting with Rumsfeld about how many troops we were going to need for the invasion. Franks wanted 400,000 which was the number that most of the Generals at the Pentagon were comfortable with in order to get the job done. Rumsfeld was insisting on using only 75,000. Franks kept fighting with him about it until he finally gave in and he ended up coming up with a compromise figure of 160,000 for the initial invasion. We are having so much trouble keeping the lid on Iraq with this compromise figure even now can you imagine how much worse the security issue would be if we only had the 75,000 Rumsfeld wanted to put in with his "Light Footprint" idea for the invasion? Rumsfeld is this generations Robert McNamara. He should have been smarter than this and he should have known better. I cant figure out why after some 50 years in government he ended up being so stupid about it all. I mean he was absolutely wrong all the time practically. He is an American tragedy.