That such things are often left hanging probably squicks out a lot of people. Being able to say that certain races are statistically more violent and less intelligent than others has historically been correlated with lynch mobs and skewed priorities when making arrests. Recurse a few levels, and what you're really saying is "After the Renaissance, Europeans took over the world and its resources, and the resource distribution has been slow to change since". African American's tend to be descended from slaves who were treated poorly before and after emancipation, while the San Francisco Bay area still has all that money from the Gold Rush. Of course there are going to be statistical differences, given those starting points.
[edit: What I'm saying, I think, is that naked statistics on these topics is not new, and in the past, were used as excuses for things that were physically and emotionally harmful. To simply state them pattern-matches to nineteenth century style racism/sexism/etc, against which the underclass rebelled after sufficient abuse.]
Recurse a few levels, and what you're really saying is "After the Renaissance, Europeans took over the world and its resources, and the resource distribution has been slow to change since".
Remind me again, why do Han Chinese have higher IQ than Europeans?
There is an unfortunate American tendency to treat all issues of race in the purely white-and-black context.
The world is much more diverse than that. Most people are brown.
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.