My seven-year-old son asked me some questions the other day that showed a strong sense of morality and analogous thinking (and made me laugh, too).
He started with the premise that we should always wear helmets when we ride our bicycles. "Okay"
He then asked if horseback riding was like bicycling in that we should also wear helmets. "Sure"
He then bought up something that he noticed watching Lord of the Rings... the Nazgul did not wear helmets when they rode their, well, whatever they ride. "That's true." At that he shook his head in disapproval.
So... in addition to be servants of the dark lord, the Nazbul are also naughty.