Two hunches:<p>1) Expertise may cause certain types of bias.<p>Recent studies have examined this idea of &quot;earned dogmatism&quot;: the idea that once you gain expertise in something, your ego builds, and that actually makes you less open minded and less able to revise or challenge your existing beliefs.[0]<p>2) Overcoming bias is different than overcoming ignorance. Categorically different, and perhaps massively harder.<p>A different study found expert philosophers exhibiting cognitive biases at the same rate as nonprofessionals, even when dealing with undergraduate-level philosophy problems.[1]<p>[0] <a href="http:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S0022103115001006" rel="nofollow">http:&#x2F;&#x2F;www.sciencedirect.com&#x2F;science&#x2F;article&#x2F;pii&#x2F;S0022103115...</a><p>[1] <a href="http:&#x2F;&#x2F;cushmanlab.fas.harvard.edu&#x2F;docs&#x2F;schwitzgebel&amp;cushman_2012.pdf" rel="nofollow">http:&#x2F;&#x2F;cushmanlab.fas.harvard.edu&#x2F;docs&#x2F;schwitzgebel&amp;cushman_...</a>