Apparently this didn't sink in last time, so let me try again - there are good witnesses in the DP, and lousy ones. Simply watching the video or reading the book doesn't mean you're able to distinguish between the two.
Here's one of the good ones, whom I've had the pleasure to meet and interview myself - Bob Salas.
Here's one who has been shown by UFO researchers, after extensive research, to be full of it - Cliff Stone.
The problem comes when you mix the two, as Greer did (for what reasons, one can only speculate). How many folks here have ever argued cases before a court? I have, and I can tell you that a case is only as strong as the weakest witnesses or evidence that you present. Science works the same way. And that's what this is all about - the presentation of evidence.
Maybe Greer was just hopelessly naive (I don't think so, but I recognise opinions can differ here), and took everything at face value. The problem with that is that you haven't vetted the witnesses, and removed the bad ones who taint the good testimony, as well as the ones who might be questionable.
But that's ufology - a lot of people don't actually look at the evidence, do the research, and make the tough choices to reject those things and people which / who can't be verified (and the ones who do are often attacked by the True Believers). The result is a long list of frauds and liars who taint the overall case in the eyes of the public, and science, and government, and anyone else outside the narrow little world of ufology who might be in a position to make a positive contribution.
Or, as Kevin Randle put it back in 2001:
http://www.virtuallystrange.net/ufo/updates/2001/may/m14-025.shtml
Or, as Stan Friedman put it back in 2001:
http://www.virtuallystrange.net/ufo/updates/2001/may/m12-020.shtml
Or Dick Hall:
http://www.virtuallystrange.net/ufo/updates/2001/may/m03-005.shtml
Or Project 1947's Jan Aldrich:
http://www.virtuallystrange.net/ufo/updates/2001/may/m04-010.shtml
And, just for fun, a final thought, from former CAUS founder Brad Sparks on the "good doctor":
http://www.virtuallystrange.net/ufo/updates/2005/mar/m30-021.shtml
To quote Brad, who has interviewed more senior military and intel people over the past 30 years than anyone, Greer is:
"The ultimate spoiler and stinker who has ensured that for generations to come there will _never_ be a Congressional investigation or hearing on the Air Force and UFOs or the AF and Roswell, because all the legitimate witnesses are contaminated with others who are liars and ringers and because all efforts at securing Congressional hearings on UFOs or Roswell are dominated and/or controlled by this spoiler."
It's not as if Congress is unwilling to look at the prospect of ETI, either. See:
The Other Side of Truth: Congress & Intelligent Life in the Universe
As I wrote:
"It is clear that the committee is open to the possibility of alien life 'out there'. Given that, how hard would it really be to get Congress to discuss UFOs if it were people like Dr. Peter Sturrock approaching them, as opposed to 'Disclosure Project' true-believers?
How hard? Not very, I think, especially if presented properly, by the right people.
Which is why Dr. Steven Greer et al have been such a disaster."
Paul