Given that their methodology is incompatible with scientific reasoning

Not something you have shown (or something that appears remotely credible).

and their attitudes incompatible with maximising global utility for all sentient stakeholders,

Not much better and also not a particularly good reason to exclude an information source from an analysis. (An example of a good reason would be "people say a bunch of prejudicial nonsense for all sorts of reasons and everybody concerned ends up finding it really, really annoying").