Maybe it's not a principled stance. Maybe it's a calculated risk. If the war doesn't happen or turns out badly, Kiesling stands to profit career-wise big time when or if the Democrats get back in the White House. There could be an ambassador-ship waiting for him. Plus, his retirement is vested and if he's wrong, he still has contacts that any company who does business in foreign markets can use.
I guess I'm just a little suspicious of people who make grand gestures. I always look for the hidden kicker.

troll