People who buy into one denialism may support others for this reason. Dan Kahan at Yale Law School has found that people's views on social issues such as abortion and same-sex marriage predict their position on climate science too. This, he argues, is because social conservatives tend to be pro-business and resist the idea that it is damaging the planet (Nature, vol 436, p 296).
But other denialisms suggest psychology, not just ideology, is crucial. There is no obvious connection between conservatism and vaccine or AIDS denial, and flu denial was promulgated by a left-leaning group suspicious of the vaccine industry.
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George Lakoff, a cognitive psychologist at the University of California, Berkeley, argues that conservatives have been better than progressives at exploiting anecdote and emotion to win arguments. Progressives tend to think that giving people the facts and figures will inevitably lead them to the right conclusions. They see anecdotes as inadmissible evidence, and appeals to emotion as wrong.
The same is true of scientists. But against emotion and anecdote, dry statements of evidence have little power. To make matters worse, scientists usually react to denial with anger and disdain, which makes them seem even more arrogant.