I agree, within the human race, enormous variations in intelligence, opinion, morality, development et al exist. But there is a good chance that aliens, if they exist, don't think or behave like humans. Maybe they are some Borg-like people with a collective mind. Anyway, I'm pretty sure that IF they exist, they leave humanity alone. With the mess we're making, they'd steer clear from the depraved, self-destructing human race. Can't blame them...