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Originally Posted by eburacum45
I agree, we should try to remove all preconceptions about intelligent alien civilisations, and simply go on the evidence. This is what Bostrom tries to do, I believe.
At the moment there is merely an absence of evidence.
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He may try to go on the evidence, but his deductions from that evidence are flawed. Or would be, if we had evidence yet.
But I think you're on the right track.
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At the moment, the 'great Filter' hypothesis is only that, a hypothesis.
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To my mind, it's a hypothesis along the lines of the Moon Hoax hypothesis