LH, as far as I am concerned you are free to speculate away - but I have encountered all of those thoughts before - even had some of them myself. I still haven't seen any evidence for aliens though. As far as I can see the Fermi Paradox still holds: They ought to be out there but so far we've seen no convincing evidence for them (and you can rant and rave to your heart's content, LH, and call me all the names under the sun, but I'm not convinced by UFO sitings).

But here's another thought. Isn't there something a bit Judaeo-Christian about all this stuff about superior beings (angels?) from the sky coming down to help and/or pity us 'poor sinners'? I can't help noticing that you tend to come over all 'evangelical' when you write about them and get all sort of 'wrathful' about us poor 'unbelievers' (although I'm definitely not an unbeliever but a sceptic - there's a world of difference). I would like to speculate, if I may, that your beliefs may be culturally determined and have a strong religious character to them.

Finally, the cost and difficulty of interstellar must be immense and it still seems unlikely to me that a space-faring people would travel that far just to disconcert a few Americans and Canadians ... and, OK, the odd Peruvian and airline pilot.