Science deniers never cease to amaze me with the tactics they use to discredit research and people. So they cannot win the debate on the science as it’s not on their side. This causes al kinds of interesting mental processes and conspiratorial thinking to deal with this disconnect from reality. Research by Smith and Leiserowitz shows that conspiratorial thinking is the number one response from climate science deniers towards global warming.
This is also why you see the assumption among science deniers that people have at best “questionable motives” or at worst “nefarious intent.” Which largely explains the defamation you see on science denier blogs and websites. It doesn’t take much for science deniers to jump from assuming nefarious intent to assigning nefarious intent and screeching “fraud” and “fakery” (see ‘climategate‘ for the perfect example).