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Given that humans currently have both stealth and near optic invisibility technology, why would alien craft be seen by humans if the aliens did not want to be known about? (And if they did, why doesn't everyone at this point know the truth?)
Are crashes of alien craft at all likely given that such craft are by definition extremely sophisticated and can navigate through interstellar space, avoiding all sorts of hazards? Do they simply run out of fuel? Seems very unlikely to me.