Originally Posted by Racnad

Let's clarify our language here. UFO stands for "Unidentified Flying Object." So do I beleive that people see flying objects they can't idenfity? Of course I do! (Ironically, if you're certain you've seen Starbuck flying her Viper in from the planet Caprica, you've identified it and it's not a UFO)

The question, "Are UFO's spacecraft flown by alien civilizations?" is an entirely different question. Here's some thoughts on this.

It is jumping to a conclusion to conclude that if it's not a bird, a plane or a helecopter that it must be an intersteller spaceship. You also have to consider that it might be a rare atmospheric phenomena that is not well understood. Although we've been on this planet a long time, it still gives us surprises.

Anyone who says there is or is not intelligent life elsewhere in the universe is speculating. We don't know, and any conclusions on that question depend on what assumptions you are making.

If intelligent life does exist it is very rare and technological civilizations are even more rare. The SETI Project has been looking for radiological evidence of alien civilization for for decades and has found nothing so far. While we can't conclude whether or not life exists elsewhere, we can conclude that this neighborhood of the galaxy looks nothing like the visions of Gene Roddenberry or George Lucas. (I'm intrigued by the universe of BSG - other than humans and Cylons no other intelligent life is known - this scenario is more likely.)

There has always been a small percentage of people who are fantasy-prone and beleive they are visited by and communicate with non-human beings. But the form these beings take depend on their world-view. In times gone by, people were visited by trolls, elves or faries. While religious people see angles, demons or dead pophets, most people aren't that religous, and no one beleives in faries. But most people for the past few decades do believe that aliens may exist and have seen science fiction TV and movies about them, so it is no coincidence that these people claim to have been visited by greys inspired by X-Files and Close Encounters of the Third Kind.

So my answer to "Are we being visited?" is "probably not."