I agree! But it's often easy to arrive at conclusions that are comfortable (and happen to be true). It's harder when conclusions are uncomfortable (and happen to be true). All other things being equal, folks probably favor the comfortable over the uncomfortable. Lots of folks that care about truth, including LW, worry about cognitive biases for this reason. My favorite Freakanomics example is the relationship between abortions and crime rate. If their claim were true, it would be an extremely uncomfortable kind of truth.

You may be right that the general audience already knows this about science. I am not sure -- I often have a hard time popularizing what I do, for instance, because I can never quite tell what the intended audience knows and what it does not know. A lot of "popular science" seems pretty obvious to me, but apparently it is not obvious to people buying the books (or perhaps it is obvious, and they buy books for some other reason than learning something).

It is certainly the case that mainstream science does not touch certain kinds of questions with a ten foot pole (which I think is rather not in the scientific spirit).