Tangentially... I know it should not be important, but I am still curious: Is there any example where knowing the truth about genetic causes of personality traits lead to some outcome benefiting humanity?
Because the negative outcomes, e.g. eugenics and racism, are widely known, and people will point them out when talking about "politically incorrect" research, in fact claimimg that the potential damage caused by such knowledge is much greater than a potential benefit, and knowing the truth just for the sake of knowing some technical truth, should not be more important than e.g. avoiding a genocide. Yeah, I know it's an exageration, but the idea is: such knowledge can cause harm (and here are the examples), and cannot cause any good (at least I don't have an example). So it's about the instrumental value for the society as a whole, of having this knowledge.
(For me personally, the idea that "when you lie once, the truth is forever your enemy; and all truths are connected" is a sufficient answer, but it probably wouldn't be enough for other people. Especially when the connection of all truths is not very relevant for humans who compartmentalize as they breathe. So I would like to have a more tangible example.)
I don't think eugenics is obviously bad. For example, what if we were to start sterilizing criminals, as another punishment in our current regimen of (community service, prison time, fines, imprisonment, capital punishment)? Seems like a pretty obvious win to me.
I also think it's possible that if more people realize how large the genetic contribution to intelligence is, we'll see more research in to its genetic basis and how we can genetically engineer future humans to be smarter... a very soft and friendly kind of singularity.
Related: The Blank Slate, The Psychological Diversity of Mankind, Admitting to Bias
"Hjernevask" a well known (in Norway at least) documentary series that I am sure will be interesting to rationalists here is now available with English subtitles online. Produced by Ole Martin Ihle and Harald Eia a Norwegian documentarian and comedian, it casts a light on both ways in which we know people to be different as well as the culture that is academia in the Nordic country and probably elsewhere as well.
The Series
The link go to the YouTube videos with English subtitles. Because linkrot sucks I'm providing another source for the videos.
Some Commentary
There was very little in the series that I found new and disagreed with some presentations. But this is not surprising given my eccentric interest in humans. (^_^) I found the interviews with the scientists and academics interesting and think that overall the series presents a good overview something well worth watching especially considering some of the debates I've seen taken place here recently. (;_;)
The latter wrote that in a 2010 article on the documentary series that I would also recommend reading. HT to iSteve where it is quoted in full.