Unfortunately the debate as to their nature and purpose has been hijacked by those with a specific agenda versus the sceptics. The result is just as the aliens want - deception, untruths, confusion, disbelief, ignorance, ridicule, disempowerment - so that, in the off-chance that one may encounter an alien, one would be powerless to deal with it, even if one could even recognise it.
"When you come into their power, one of them who is their guard will say to you, 'Who are you or where are you from?'
You are to say to him, 'I am a son, and I am from the Father.'
He will say to you, 'What sort of son are you, and to what father do you belong?'
You are to say to him, 'I am from the Pre-existent Father, and a son in the Pre-existent One.'
When he says to you, [...], you are to say to him [...] in the [...] that I might [...] of alien things?' You are to say to him, 'They are not entirely alien, but they are from Achamoth, who is the female. And these she produced as she brought down the race from the Pre-existent One. So then they are not alien, but they are ours. They are indeed ours because she who is mistress of them is from the Pre-existent One. At the same time they are alien because the Pre-existent One did not have intercourse with her, when she produced them.'
When he also says to you, 'Where will you go?', you are to say to him, 'To the place from which I have come, there shall I return.' And if you say these things, you will escape their attacks."
First Apocalypse of James