Avoiding Aliens

How about an attack by nanobots, or maybe a designer virus type thing? They get them here in probes launched from way out beyond our nuke's reach, let the little guys do the dirty work, turn them off, and walk in uncontested.

Well, I'm not sure I buy it. I don't doubt you're accurately portraying the limitations of these technologies as they exist today here on Earth, but we're talking about a super-advanced species and all that.Having said that, however, we may as well argue who would win in a race, Superman or Flash. Plus I agree with the general point of view your expressing on this thread, so I'll drop it.

There may be alien psychological reasons why they might want to subjugate us, quite apart from any question of resources. Maybe their evolution led to their adoption of a hierarchical system where those higher up are responsible for running the lives of those beneath them. This might make them think that taking control of us is the moral thing to do. They may be incapable of seeing it "our" way.