How should 2016 Republican candidates talk about the Iraq war?

Regardless of how you feel about George W. Bush, the pre-war intelligence, Michael Moore and the anti-war left, or the opportunistic flip-floppers like Hillary Clinton and John Kerry, is there anyone who would argue that the price America paid in its battle in Iraq was NOT too high? Does anyone doubt that the electorate largely believes that military intervention in Iraq was an enormous mistake, spending ungodly sums of money and losing far too many fine men and women for a raging land of sectarian ingrates, so eager and willing to fight each other or our people who were trying to help them, but falling apart and running in the face of ISIS? At what point are we allowed to get angry at young men in Iraq, given a chance to live in something better, freer, and more prosperous than the barbaric mad despotism they experienced under Saddam Hussein, who threw it all away to join ISIS?