Any civilization capable of *choosing* whether to visit us or not would have little to fear from us. And in their place, would you really shun the opportunity to learn of a whole new biosphere and an emerging civilization, just because some of the locals are jerks and the jerks might be winning?
They won't just be finding humans; they'll be finding a whole ecosystem. If life is rare, it'll be among the most fascinating discoveries of their history. If life is common, I bet every new world is STILL really cool. As for their opinion of humans...evolving ain't easy, and I bet they know that.
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