I don't think it's useful to steer the discussion towards such extremely charged issues, as if there were no other ones pertinent for the topic. Even if the whole class of biases you describe were absent, there would still be plenty of questions where (in my opinion, at least) a consistent skeptic would have to take up issue with the consensus of the academic institutions. (By "consensus" I also mean situations where there exist significant disagreements within the academic mainstream, but all the positions acceptable within the respectable mainstream share some underlying assumptions, which it is not possible to dispute without consigning oneself to an unacceptable contrarian status.)

In many of these areas, contrarian opinions aren't particularly scandalous, and one doesn't have to fear any serious repercussions for voicing them. (Unless one aims for an academic career in a field under direct bureaucratic control by the purveyors of the disputed official truth, of course.) The problem is that contrarian statements tend to sound just laughably wacky, like the rants of a physics crackpot, unless one accompanies them with lengthy and careful arguments in order to bridge the inferential distances. (And finds an audience willing to give them a fair hearing instead of just laughing them off, of course.) This is often just too time-consuming, and possibly also too demanding on one's interlocutors.

However, the existence of such topics is, in my opinion, particularly damning for the selective skeptics of the sort I've been criticizing. Here they don't even have the excuse that contrarian opinions would be too offensive and inflammatory to bring up. Their silence betrays either complete lack of critical thinking about such topics or the unwillingness to take even a minor status hit by dissenting from the highest-status purveyors of respectable opinion -- in any case making their self-designation farcical.