This was not about low representation being an argument for discrimination, this was about people in a field out and out admitting in huge numbers that they would blatantly discriminate against people hurting their careers because of political affiliation!
If you want to get a job providing safety equipment for workplaces, you should probably not proclaim that you believe that workplaces are too safe. If you want to get a job as a doctor, you should probably not announce yourself as a believer in Christian Science and faith-healing. If you want to get a job as a Friendly AI researcher, you should probably not declare that you believe any AI that has been blessed by the Pope is assuredly friendly.
The common use of "conservatism" today proudly includes positions that are anti-science; as such, it is unsurprising that scientists might consider affiliation with that label to be evidence of incompetence, unseriousness, or opposition to their field. I do not see a need to introduce the hypothesis of "political bias leftward" when it is quite possible that t he scientists doing this so-called "bias" are merely taking the claimed beliefs of conservatives seriously.
If you want to get a job providing safety equipment for workplaces, you should probably not proclaim that you believe that workplaces are too safe.
It looks like here you have inadvertently provided a good argument for the opposite of what you wanted. Namely, what you write applies even if your belief that workplaces are too safe is correct. (Workplaces can certainly be too safe by any reasonable metric, at least in principle. Imagine if office workers were forced to wear helmets and knee pads just in case they might trip over while walking between the ...
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.