“The Flight of Aeneas” (1595), by Peter Brueghel
I can’t remember if it was the late Col. David Hackworth or the late Col. Harry G. Summers Jr. (author of the influential retrospective on the Vietnam War, On Strategy) who made the telling point that any American general in World War II worth his stars would make it his business to know the names and backgrounds of all of the German generals opposing his forces, and that, by contrast, very few American generals in Vietnam knew even the names of the North Vietnamese Army generals opposing them, much less their backgrounds.
So I agree wholeheartedly with Jeet’s contention that as a matter of military strategy, demonizing the enemy is dumb. In that regard, the Greek warrior ethic is indeed of significant utility, as was the chivalric code of medieval Europe which assumed that one’s opponents were fellow Christian combatants who should therefore be taken seriously on the field of battle (and of course whose personal identities and histories would be well known to both sides).