This is not an important criticism; it is ad hominem in its purest form.
In certain contexts, where someone is relying on someone’s expertise and lack the resources to evaluate the details of a claim, then relying on experts make sense. If a given potential expert has a reason to be biased that’s a reason to rely on that expert less.
In certain contexts, where someone is relying on someone’s expertise and lack the resources to evaluate the details of a claim, then relying on experts make sense. If a given potential expert has a reason to be biased that’s a reason to rely on that expert less.