The history is, of course, a bit different there. And religion is a matter of belief, rather than something immutable.
Finally, I am bothered by some of the discourse around religion -- the sort that is merely racism by another name. I am aware of the standard arguments for the unique awfulness of Islam, but they seem to me to be related to the fundamental attribution error. The reasonable argument against religion is error theory. The rest is a waste of time.
The history is, of course, a bit different there. And religion is a matter of belief, rather than something immutable.
I don't see what either of those have to do with your stated reasons.
Near as I can tell your arguments are:
1) People of different races provide different perspectives so we shouldn't make them feel excluded.
Well, religious people also provide different perspectives, and this effect is much stronger for religion.
2) Not making people feel bad is intrinsically valuable.
This applies equally to religious people.
Summary: Current social psychology research is probably on average compromised by political bias leftward. Conservative researchers are likely discriminated against in at least this field. More importantly papers and research that does not fit a liberal perspective faces greater barriers and burdens.
An article in the online publication inside higher ed on a survey on anti-conservative bias among social psychologists.
The link above is worth following. The problems that arise remind me of the situation with academic and our own ethics in light of this paper.
I can't help but think that self-assessments are probably too generous. For predictive power of how an individual behaves when the behaviour in question is undesirable, I'm more likely to take their estimate of how "colleagues" behave than their estimate of how they personally do.
This shouldn't be surprising to hear since to quote CharlieSheen: "we even have LW posters who have in academia personally experienced discrimination and harassment because of their right wing politics."
While I can see Lammers' point that this as disturbing from a fairness perspective to people grinding their way through academia and should serve as warning for right wing LessWrong readers working through the system, I find the issue of how this our heavy reliance on academia for our map of reality might lead to us inheriting such distortions of the map of reality much more concerning. Overall in light of this if a widely accepted conclusion from social psychology favours a "right wing" perspective it is more likely to be correct than if no such biases against such perspectives existed. Conclusions that favour "left wing" perspective are also somewhat less likely to be true than if no such biases existed. We should update accordingly.
I also think there are reasons to think we may have similar problems on this site.