Discussions surrounding UFOs and alien abductions are as useless as male nipples. This is not the forum for such pseudoscientific nonsense.

If, on the other hand, you'd like to discuss such things as SETI, the Drake Equation, the Fermi Paradox, and the potentials for space travel and colonization, then that's a different story.

why do you not consider it scientific?  
There are unusual objects that are removed from people and numberous eyewitness accounts of fully awake experiences that were remembered without hypnosis.  There is also video taken from many different viewpoints of strange aircrafts.

Many people seem to be investigating the phenomenon in a scientific way.

Theories concerning where these creatures come from are not limited to some dogma about other planets.

People come forth and tell what they remember, and people make theories to account for those memories. It is not very much different than someone writing down the number of ticks he remembers hearing from his watch while a ball rolled down an incline and then developing a theory that the speed of a falling dense object is not affected much by its mass.

What makes you so sure that people are not being abducted by small grey humanoids?  It is your memories of scientific data and theories that you recall.  But how do you know that the data you read about is true?  Perhaps your memory of reading about that data is actually the memory of an extremely vivid dream you had and are mistaking for real life?

If someone comes on an ocean ship from a faraway land and claims to have seen an orange furred creature that lives in trees and has a face and body very similar to a humans, a person from a past century might believe that this person had a very vivid dream of seeing such a creature that he has mistaken for reality.   But to assume that this person is having such a realistic dream and now believes it to be a memory of real life is about as unusual as the existence of a hairy orange man shaped creature that lives in trees.  Most people do not mistake dreams for real life, unless they are still in the dream when they make the mistake.

More of the people who deny the existence of strange humanoids who visit or abduct humans seem to think in the religious dogmatic irrational way.  Most of the people who believe that such beings do exist seem rational and scientific.

To confound matters many people lie about what they believe to help their reputations.
People who have no reason to believe in nonhuman intelligent humanoids often pretend to in order to seem more interesting.   People who consider it highly likely based on second hand evidence feign disbelief in order to keep their  reputation of being knowledgeable about scientific data. People who remember clearly having been abducted by such beings themselves lie in order to keep their jobs.

The most likely hypothesis to explain the data I remember having seen is that there does exist some group of humans or humanoid primates who have achieved high levels of technology and now experiment on us, their cousins.

It is unlikely that they are genetically unrelated to us, because the abductees generally report creatures that look almost human in their skeletal structure.   They are somewhat likely to actually be humans, and even the same breed of humans as the rest of us.
Their strange eyes and body proportions may be caused by drugs or machine implants.
I am sure that there are many normal humans among us who would not mind having their bodies look very strange if it was likely to slow their aging by some large factor.  Perhaps some humans found out that if certain things are done to an embryo that the brain develops much larger and eventually becomes much more intelligent.

The creatures probably have some technology that allows them to control and read the mental imagery of other creatures.  We ourselves are actually making advances on this front, so it is not unlikely that they have it developed to such an extant as to effectively be telepathy.

If you claim that there are not any such creatures and none of the abductions are real , then why do so many people appear to believe that it happened to them?  

Note that some people are stupid enough to believe that if they have a clear vivid mental imagery of some event then it must have actually happened to them at some time in the past.  This is not memory, even though these people may call it memory.  This is just some conclusion they drew that is not well thought out.

But there are many people who are not making that error, and have clear recollection of abduction experiences.  

None of this is compelling empiricial evidence. It's pure conspiratorial claptrap. And the fact that you think little green men fart around in their spaceships gathering pissed-up trailertrash for anal probing show you have no clue about transhumanism and the potential for advanced postbiological intelligences.

Great answer, George, to his long post.

Unless any of these alleged aliens are going to help or hinder transhumanism, they're not relevant.

The evidence does not compell your belief.  But how much of the evidence have you actually read or experienced?

Do you have some evidence that is likely to compell people to believe that there are no advanced humanoids flying around in strange vehicles, and doing experiemnts on people?

If what most of the claims of the people who allege contact is true, then gathering data about the activity of such advanced humanoids could be very helpful in letting us back engineer their biological technology.

That's an unscientific approach.  We can't present evidence that is likely to compel people to believe that there are no such thing as fairies either.

From what I've read, even the alleged UFOs have demonstrated no signficiant biological advances, if all they can do is chop things up and implant pieces of plastic.

Some of the accounts have human appearing strangers who visit the abductees periodically and appear not to age between encounters that are spaced many years apart. See Budd Hopkins latest book.  

This does not imply that they have conquered aging  because they may just be caused by relativistic effects.

Maybe you are concerned that other people will think that tranhumanist sare stupid if you talk about alien abduction.  Some will. But so many people are coming forth reporting what they have seen  that it is getting less dangerous for one's reputation lately to admit belief that this phenomenon is more likely real than fantasy.

In the 19th century, abductions were blamed on fairies, not UFOs.  Back then, it was changelings, not abductees.  Fairies also were apparently ageless.  I don't find those stories any more credible.  It's merely an old myth wrapped up in modern technological clothing to make it more palatable.

As far as using UFOs as inspiration for research, that's no justification.  Science fiction does just as well for inspiration, but that doesn't make Star Trek true.

http://www.skepdic.com/  - it has a lot to say on the subject.