The answer in a nutshell based on the latest release of Climategate 2 emails:
Because the science of Global Warming as practiced by the GW advocates is no longer a science - it has morphed into a "cause". And, to these people, supporting this "cause" is more important than preserving the basic principles that are the foundation of real science. Those principles require a continuous probing of your basic theories and never-ending doubt that your assumptions are in some way flawed. Those principles are totally absent from the current "research" conducted by the Global Warming Advocates. To these people, global warming (or lately climate change) MUST be shown to be true and man-made in order to convince society to make massive, economy destroying investments in clean energy and equally massive transfers of wealth from the U.S. and European nations to the third world. Given this mindset, who would be surprised that it is junk science and not climate science that we have ended up with.
“- it has morphed into a “cause”.
It is a scam. It is racketeering. Plain and simple. Just as much a con as the fancy $100,000.00 electric car scams (Fisker Automotive, Tesla Motors) all of which are mechanisms by which taxpayer monies are stolen Aided and abetted by Congress and staffers on Capitol Hill-many unwitting participants-suckered by their warm and fuzzy feelings about the cause du jour—but led by those criminally inclined. Undoubtedly much of which finds its way back into “campaign financing” or offshore accounts .
Exactamundo my friend! While I am NOT a "denier" by any means, the FACT of the matter is, SCIENCE has been corrupted, or perhaps exposed, but the Cult of Global Warming. This is a demonstrable fact, as these emails have shown. Not only that, but even "new believers" like Muller have admitted in the past that they have known that some scientists were purposely exaggerating the issue because it was the only way to get the public on their side.
While I do believe there may be "something" to GW, and AGW, and CO2 release, etc, at this point I don't think I will ever know, in my lifetime, what the damn truth is. I am disgusted.