His entire legacy as president is bound up in Iraq. Which is another way of saying that his legacy is pretty clearly an irrecoverable shambles. That is why, as the folly of the enterprise becomes more clear, he must continually puff it up into more and more melodramatic and world-historical dimensions. A century long ideological struggle and the like. For the president a one in a thousand shot at some better outcome is well worth it, no matter what the cost. Because at least that's a one in a thousand shot at not ending his presidency with the crushing verdict history now has in store. It's also worth just letting things keep on going as they are forever because, like Micawber, something better might turn up. Going double or nothing by expanding the war into Iran might be worth it too for the same reason. For him, how can it get worse?
And when you boil all this down what it comes down to is that the president now has very different interests than the country he purports to lead.
Still, it's always great fun to have a beer with an incompetent narcissist!
But it isn't just the president. It's also all of the Very Serious People who have no trouble doubling down on their bets again and again. They're playing with other peoples' money and other peoples' lives, and why not wait another Friedman or two to see if that lottery ticket hits.
It's been going on for years now, and the cowards who rule us won't make it stop.
Suck on this, Americans!