You are not the People - nor does morality necessarily follow the law. I am not going to get into long sources here, but the legality of the Iraqi War is extremely debatable. You can make good arguments on both sides.
Bush has to answer to a higher authority. Was it the right thing to do? Was it a good thing to do? That also is not an easy question. The True Believers on this site forget that Saddam was an ogre, and exacted a price from the Iraqi people every day and every hour. Nice orderly violence, of the type that the royalists on this board approve. Whether you are aware of it or not, the real objection of most Bush opponents is not to the violence, but the disorder - for Saddam was even more violent, but within the mechanism of the state.
I'll pose you a different question. During the 90's, Milosevic announced ethnic cleansing on the Balkan peninsula. After all that had happened in the 20th Century, this was a scandal, and dangerous. But the European nations, despite all the prodding of Thacher, did absolutely nothing. None of the heads of the various states are ever going to be charged by some Swiss activist with crimes - but I'd suggest they behaved with considerably less morality than Bush.
I hope you have noticed the tenor of my posts. I am not so much making the case for Bush - that remains open - but the case against the reflexive True Believers and their jumble of half-digested facts, semi-articulated theories, and raw hatred.