Agreed, but for what it's worth, while I was on jury duty a year or so ago, the judge let us know that the defendant's guilt could be determined beyond a reasonable doubt on eyewitness testimony alone.
However, if there are indeed aliens flying around, it doesn't necessarily follow that they would ever announce themselves, any more than we'd formally announce ourselves to animals at a wild animal park, which may well be how they regard earth. For all we know, an alien entity "owns" earth, and charges admission for tours of it. If a tram breaks down in an animal park, the owners don't just leave it there, they go pick it up. Anyhow, potential aliens may have some interest in us, but on the deeper level, they also may not just give much of a damn.
That was a very smart post, you really think out of the box and that made a lot of sense. I don’t believe aliens exist but still very clear think on your part. You did make me think of something funny, imagine on thier tour they say things like “Look at the little human, look at him riding in that car thing, that so cute, hurry honey, get a shot of that ....” much like we do with monkeys.