Public opinion is ambivalent on AGW largely due to the efforts of a small group of individuals which spreads FUD for the benefit of powerful interests. In the past, these same hired guns attempted to sway public opinion on acid rain, the dangers of smoking and secondhand smoke, the ozone hole, global warming, the Strategic Defense Initiative, and the banning of DDT. I recommend the book Merchants of Doubt [1], which documents this in exacting detail.
The ironic thing is that the only people spreading fear are AGW-theory proponents. If anything, climate change deniers are reducing fear, making your accusation they are spreading Fear, Uncertainty and Doubt a ridiculously easy claim to falsify.
I can't speak as to the agenda of the average climate change denier. However, the fear spread by the anti-AGW lobby is that of a global climate change conspiracy. Uncertainty and doubt are created by casting aspersions on the science.
Unfortunately some AGW proponents are guilty of fear-mongering, but I would also draw a distinction between predicting a bad outcome and spreading fear for fear's sake; it's hard to predict a catastrophe without inspiring a little bit of fear in the audience.
But the only fear mongering I've really seen come from climate change "accepters". "Accepters", see how silly it looks when you use silly names?
I've seen people who deny the science, they don't particularly concern me as they are often easy to spot as they refuse to listen to reason. But much the same can be said of the extremes on both sides of a debate.
As for uncertainty and doubt, I thought those were important in science.
That's a naive perspective. AGW Opponents spread FUD about how the proponents want to eviscerate industry and business to serve their feel-good agenda.
[1] http://www.amazon.com/Merchants-Doubt-Handful-Scientists-Obs...