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Maybe their defensive capability relies on flying away really fast. The way these new-age types cast their messianic delusions to all things alien, it would seem that any destructive technology would not be implemented in any usable form on their craft. If I were a rational alien, :) I would harness the same incredible energies that make interstellar travel possible and create planet destroying weapons that could easily rip this solar system apart.There's bound to be other species out there as technically competent, so you have to be prepared. These "messianic aliens" would have to have a dark destructive side to survive long enough to achieve interstellar travel. Why they would be interested in us, to protect planet Earth's environment, bring peace to mankind, etc. It makes no sense, they would conquer us in swift fashion if they wanted and turn our planet into a strip mine. Protecting a planet makes no sense when you have a billion planets within your influence.