I think the prime directive seems like an extremely likely scenario, any species more advanced than us would be really careful not to give us technology that might make us a threat. They probably are relatively peaceful, otherwise they wouldn't be advanced enough to get to space, although they could easily vary different value systems that conflict with ours, and probably depend on the species.

I think the possibility that they experience reality differently than we do is also really likely and so the way they travel may be really different. I think ghosts and some aliens probably have a lot in common, and life probably exists on earth in some form aside from physical, in a way that we are not able to perceive.

I think we are to them what dolphins are to us. They are playing around with ways to contact us without disturbing us too much with crop circles and all that, and maybe these videos....or maybe these videos are some kind of psy-op and not real.

Fun post!