Because these 400 people are the people that work on dodgy, black-ops, classified millitary technology!
They are the ones making the claim that much of this tech has been reverse engineered from crashed alien spacecraft. This is what makes the Disclosure Project interesting.
But I totally agree, the burden of proof of course lies with them, and it would seem it is still a burden thay cannot shake. There is no physical proof, no flying saucer wreckage to dump on the White House lawn, but these people have a lot of conviction, I see no reason why they would make it all up, but this brings me back to my earlier point about UFOs being more interesting than grime.
The real reason it's interesting is because its escapism. I'm right in the middle of starting a non-profit, (
www.wedia.tv plug plug plug), and indeed find it really depressing to think about serious problems like poverty etc, which I seem to be doing a great deal of. The Disclosure Project and it's problem, real or imaginary, is not depressing. It's a glimmer of hope if you take it seriously. Interest in UFOs, religon and funky house is peaking cos people want escapism, not depressing news of terrorism, world poverty, or indeed, the state of the grime scene.
That being said, UFOs are being seen all around the world and reported all around the world (today in Iran for example:
http://www.ynetnews.com/articles/0,7340,L-3354296,00.html ) and much of the dismissive skepticism in the US and UK around the subject is incredibly unscientific.
For example, the Mexican Air Force filmed a fleet of eleven UFOs flying through their airspace with incredibly sophisticated infrared cameras, for more than half an hour, giving off all kinds of weird temperature data, and one even breaks formation and begins following the Mexicans until they back off (you can see this here:
http://video.google.com/videoplay?docid=-6737356340134876703&q=mexican+ufo+footage) The Mexicans hold a press conference saying very honestly "we don't know what these things are" and present the film to the world's media. US intelligence laughs at them at says 'it was just swamp gas' with no proof, or indeed any nearby swamps.
Anytime the mainstream media 'debunks' a UFO sighting with no proof, it's taken as fact. That's not science, that's spin.