As JimBowie was just kind enough to show us, those who fall for one conspiracy theory tend to fall for a pack of them, so deniers are often involved in other conspiracy cults.
Now, back to the secondary topic. In every branch of science, all the data is corrected and often estimated. So why the crazy double standard by deniers, where they selectively melt down over it only for one single branch of science? Any real scientist is going to say "So?" when it's pointed out that data is corrected and estimated. Deniers don't seem to understand how science works. Instead of correcting the data to get good results, deniers want the data left with the errors in it, so that it gives bad results. That' is, deniers are the ones essentially demanding that the data be fudged and faked by not correcting for known errors.
And finally, the funniest thing. The raw data shows _more_ warming than the corrected data. That blows the denier conspiracy theory out of the water. If scientists wanted to show more warming, they just had to do what deniers demand, and use only raw data. Instead, the scientists expend great effort to correct the data and make the warming look _smaller_.
Deniers are just claiming the opposite of reality. Lying, that is. They may not realize that they're lying, being their cult has brainwashed them so thoroughly, but rest assured all the scientists know with great certainty that the deniers are lying.