The Iraq war was a no brainer. Saddam had been a threat to the region which prevented growth and development throughout, he used the implied threat to bully neighboring countries, al qaeda types and other small minded anti-americans saw allowing Saddam’s apparent (real or not) transgressions as taking face from America, and Saddam’s large army and the uncertainty of WMD made taking on Iran impractical.
We had pocket Aces, the flop was two Aces and a King. Saddam was bidding up the pot and bullying his neighbors suggesting he had a full house. What are we supposed to do, fold? We have 4 aces, it doesn’t matter whether or not Saddam has the boat. If he wants to go all in, you take him all in.
Worth reading in full.