I think this video is relevant to this discussion:
http://www.huffingtonpost.com/2011/02/04/uncontacted-amazon-tribe-video_n_818621.html
I can help but wonder how these tribesmen describe the loud white bird circling their village to those who haven't seen it...
Interestingly, the leading researcher wants to allow the tribesmen decide for themselves to make contact.
I've argued the same for our heavenly watchers. They'll descend, when we decide, as a global community, that we want to make contact.
---
CONVERSATION WITHIN THE TRIBE:
Witness: "So, did anyone else see that loud white bird today?"
Skeptic Tribesman: "Why are YOU the only one who ever sees this L.W.B. Do you have any PROOF that you saw this L.W.B., did it drop any feathers, did you find where it nested?"
Witness: "No, but Umfu saw it too, an he drew this picture."
Skeptic Tribesman: "That doesn't look like any bird I've ever seen. Were you guys drinking the spit beer again?"
Witness"No. But Umfu and I think the L.W.B. is piloted by some sort of advanced intelligence, since it circled us several times. As it flew away, we waved, and it circled back, and waved its wings back at us."
Skeptic Tribesman: "Bwaaaa Haaaaaa Haaaaaaa! You CAN'T be serious! An advanced intelligence...? Do you have any evidence whatsoever?"
Witness"No."
Skeptic Trivesman: "Then shut up, you are just telling stories, again. Your anecdotes are useless."
Witness: "But you don't understand, this could be our chance to make contact with a superior race, and join a larger world beyond this little patch of jungle."
Skeptic Tribesman: "Why don't you bring back some proof, then we'll talk."
Witness:
...shrugs and walks away mumbling ... "Ignorant skeptic..." Takes boomerang and brings down the next plane, brings parts to skeptics.