Joe knew it was wrong but since he is part of the US Military War Machine, he helped vote the USA into the war. War is a great money maker. Joe knew it was a bad idea but he is subservient to the War Machine. You know, the Swamp. Trump would never do that because he is smarter than Joe. He is not subservient to the War Machine. People voted for a War Monger.
Joe won't be around for long, if he's inaugurated. He even said so himself during a campaign rally speech.
Congress Members Who Voted Against the 2002 Iraq War I don't see Joe on this list: https://www.thoughtco.com/2002-iraq-war-vote-3325446
He didn't sound so strongly about the latest invasion of Iraq, but wished it was done correctly the first time. Interesting find there.