Think of the way that the late and unlamented Bush administration based its foreign policy on a storyline that was essentially borrowed from superhero comics. We’re the good guys, therefore anything we do to the bad guys is justified; they’re the bad guys, therefore their behavior is motivated solely by their own badness, nothing need be done about the abuses they claim to be avenging, and everyone can be expected to cheer when the good guys clobber them. It’s a familiar story line. Apply it to war and politics in the real world, though, and it turns into an epic source of failure.