If you think Bush was comfortable going into Iraq, you are badly mistaken. He was pushed into it by Cheney and Rumsfeld. He was presented shoddy intelligence from Tenet, and even Bush recognized that the intelligence was poor. According to an ex-CIA agent (can't remember his name), Bush looked at Tenet and said "That's it?" Tenet responded that it was rock solid. A few days later, Bush went to Condoleeza Rice if she thought he should continue to pursue Iraq because he wasn't sure it was the right move....Rice responded that she thought yes, it was a good idea. That is from a personal friend of Rice's who also wrote a biography of her.
Bush is not near as much of a tyrant as you paint him to be. He is not some wild renegade who wakes up in the morning with a desire to oppose everyone else. He doesn't wake up in the morning wanting to bomb other countries unconditionally. In some instances (particularly wiretapping and torture instances), he should have used better discretion, but to lay an entire country's failings on a single man is just ludicrous.