Check out this interview....
Jacques Vallee - On Messengers of Deception | The Daily Grail
I think both sides of this mini debate are expressed in his answers.
Also this from his book Dimensions "A Casebook of Alien Contact"
It has become impossible to listen to the radio or watch television without being exposed to
testimony about encounters with strange aerial objects and their alleged pilots. While many of these
claims seem ludicrous, and some fit easily within the scope of psychopathology, a genuine sincerity
shines through most of the stories. Unless one assumes that the world is forever restricted to the
normal phenomena already known to science, it is difficult to deny that the witnesses have been
exposed to a deep, unusual, and even terrifying event, and that it involves a form of intelligence we
have not yet recognized.
The temptation is great, at this point, to jump to the first conclusions that come to mind. It is
annoying to be confronted with something unexplainable, especially when it is threatening and
questions everything we have been taught about the nature of the universe. So we grasp at straws.
Perhaps, we fantasize, we are being visited by beings from another planet. Perhaps our government
will soon reveal that some of our scientists know about "them" and can explain their motivation.
Perhaps everything will be all right.
Those of us who have studied this phenomenon for a long time (in my case, since the intense waves
of sighting of the fifties in Europe) have learned to resist the temptation to jump to premature
conclusions. If there was ever a situation in science that called for the careful sifting and screening
of data and for questioning and testing of every hypothesis, it is the situation presented by the UFO
phenomenon.
Readers of my previous books know that for the past twenty-five years I have advocated a serious,
long-term inquiry into the phenomenon. I consider the rich experiences presented by the witnesses
as an opportunity to do some good science and, even more importantly, to combine the efforts of
several sciences to explore an area of nature that is still a mystery. But I have carefully kept my
distance from the very vocal groups of researchers who claim that UFOs are interplanetary visitors;
such a conclusion is not only premature but is contradicted by several basic facts that become
apparent only when one takes a historical perspective of the field rather than studying a single case
at a time and trying to generalize from isolated events.
Part One of this book establishes such a perspective for the reader who may have been exposed only
to recent cases and is not aware that the phenomenon has been with us throughout recorded history
– not only in the form of signs in the sky, but also with a rich array of reports of contact with
strange beings on earth and even of abductions.
We are only beginning to relate modern observations of UFOs to some of the ideas that have shaped
our folklore, our religions, and our philosophies. It will take many years to reconstruct the links in
the chain of personal experiences and speculations that connect the vision of Ezekiel in biblical
times with the puzzling, moving, and often terrifying accounts of our contemporaries. But is is not
too early to begin.