Wish I could argue with that Les, but of course that quote is correct - whatever your personal beliefs. I don't think a lack of hard evidence rules out the possibility but by the same token - none of us are ever going to prove something as potentially important as visiting aliens without it.
I think if we were flying around buzzing aliens, we would make quite sure not to leave any hard evidence lying around - especially on a planet dominated by a species who might use technology gained to exploit each other. If they have been watching us - then they've already seen how close we've come to nuclear war on a couple of occasions over the last 60 years.
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