Well we wouldn't serve as food as our chemistries would be
incompatible. For resources, that's kinda hard to imagine too since
surely the same resources are all over the place closer in. The only
point I could see to visiting us is curiosity -- maybe of the tourist
type but that would be too expensive; more likely the unmanned
scientific probe type.
The real threat is if they send colonists, but it would be a lot easier
to find uninhabited places for that (and more ethical -- we need to
recognize that they probably are ethical beings or they would not have
survived very long).
Frankly I don't think they are even out there. There is no evidence and
it seems to me if they've been around millions of years there would
be. Further, the luck required to produce a technological civilization
that lasts millions of years or so must be overwhelmingly chancy, so
odds are we are alone or so close to alone it doesn't matter.
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