"It is my understanding that the UK entered into Iraq along with their ally the US because they chose too. That's called self-responsibility. They were not obligated to go into Iraq; they chose too."

You got it. Remember that it was the British government of the time who made the decision, against the wishes of a majority of Brits, and a government whose members are now being called to account in the Iraq Inquiry, just as it was the US government of the time, against the wishes of how many US citizens? As I said, will the US have the stomach to face the same truths?