Why would beings from another planet want to get in touch with us at all? Judging by our own behavior, the answers would likely be:
1) They want a new conquest to impress a neighboring planet.
2) They need another food source.
3) They need more territory.
An abstract desire for knowledge or friendly interest in what we look like would not come into it. I say the longer we go without contact being made, the luckier we are.
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