"I believe that if a tribe delegates, for whatever reason, their ethical decision making to a group with that sort personality bias then the morality that results in is perfectly valid." By what standard? Morally conservative people who make such a delegation without understanding the bias and its effects may be making a serious mistake with respect to their own values.
I agree that the broad liberal-intellectual moral personality that permeates academia, media, and Less Wrong is better by my (liberal-intellectual) standard and yours, but if we don't understand this process it will be difficult to avoid similar mistakes on our part. I wouldn't worry too much about letting slip the well-published 'secret' that most journalists, scientists, and other academics are politically liberal. The only special danger here is letting slip that a portion of these groups' support is due to personality differences rather than knowledge.
From Michael Eisen's blog:
Yuval Levin, former Executive Director of the President's Council on Bioethics, has an op-ed in Tuesday's Washington Post arguing that Obama's new stem cell policy is dangerous. Levin does not argue that stem cell research is bad. Rather he is upset that Obama did not dictate which uses of stem cells are appropriate, but rather asked the National Institutes of Health to draft a policy on which uses of stem cells are appropriate:
Lost in this superficially unobjectionable - if banal - assertion of the complexity of ethical issues involving science is Levin's (and many other bioethicists) credo: that the moral complexity of scientific issues means that scientists should not make decisions about them.