I believe this quote was a comment to the sending of the friendly container thingie sent into space with recordings of our music, teachings of our alphabet and so on. I think it's a reasonable assumption that if there is an alien species able to travel here, our planet would be of interest to them because it has evolved life and functional ecosystems and the resources that comes with it. Whether they'd be friendly or not .. I don't know. The best strategy for them could be to get rid of us without destroying the planet. However, I think a society with that level of technological advancement would be a peaceful one, at least with eachother. I don't think the "hive mind" species which are popular in sci-fi could get tecnologically advanced enough, so I believe it would be societies of individuals with a sense of morality.
All in all, I don't really believe in the technology required for them to come here in any reasonable timespan. We may be dead and gone before they ever show up.
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