Human or no, if aliens ever came to Earth, I think we should be afraid of them.
Cutting past the obvious reasons (do they come in peace or in conquest?), there are countless dangers an alien race could bring to us, one of them being disease. When Europeans migrated to the Americas in the 19th century, they brought with them diseases that killed many Native Americans. When oysters from Asia were imported to America, they brought disease to the oysters that were already in American waters. That said, I could very well see an alien race bringing to us MANY viruses that might be COMPLETELY foreign to Earth. That alone would cause much destruction; not just for humanity, but other lifeforms as well. And if the aliens decided to leave and never come back, we'd be stuck fighting those new viruses all on our own. As of now, humanity is still struggling to find cures for current diseases, so imagine a boatload of whole NEW diseases being dumped on us. [Shrugs]
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