Comment by pron

But that source X is wrong - intentionally or not, in a biased way or not - does not entail that you should trust source Y. That just doesn't follow. To prefer an alternative source you must find one that is more trustworthy.

The problem is that often we have to choose because decisions are binary: either we get a vaccine or not. For example, to decide not to get a vaccine, the belief that the medical establishment are lying liars is just not enough. We must also believe that the anti-vaxxers are more knowledgeable and trustworthy than the medical establishment. Doctors could be lying 60% of the time and still be more likely to be right than, say, RFK. It's not enough to only look at one side; we have to compare two claims against each other. For the best outcome, you have to believe someone who's wrong 80% of the time over someone who's wrong 90% of the time. Even if you believe in a systemic, non-random bias, that doesn't help you unless you have a more reliable source of information.

And this is exactly the inconsistent epistemology that we see all around us: People reject one source of information by some metric they devise for themselves and then accept another source that fails on that metric even more.