His theory is that aliens might be resource-scavenging nomads who have exhausted their home planet. This is nothing but silly speculation, in my view. A certain amount of risk aversion seems sensible when it comes to superior intelligences. But if aliens have figured out how to use and preserve enough energy to travel many light years from home, it seems doubtful that Earth would have natural resources so precious they need to kill us to take them. Perhaps they will have a biological need for something only our planet (as opposed to one of the lifeless planets in the galaxy) has in abundance, but that would really be hitting a parlay.
Of course, aliens might view humans as a budding threat or a nuisance. Historically, we haven't exactly shown ourselves to be good neighbors to our fellow humans. An alien civilization might decide to wipe us out much like we do to fire ant hills and termite mounds.
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