http://www.siteselection.com/ssinsider/snapshot/sf011210.htm
Have a look at the rankings at the bottom, and then explain why Canada, with about 3-4 times more immigration per capita, outscores the US.
The best method to protect the site from being inundated with more stuff like this is to try to stay as hacker-focused as possible, perhaps relegating the race/gender/IQ trifecta to the same status as religion and political discussion, or to accept the likely degradation in discussion.
edit: Then the strategy aswanson alleges occam is pursuing is totally misguided. Maybe a little note on the bottom of the comment box that all links are nofollowed would prevent any further such attempts.
Presuming he is smart enough to understand the implications.
I'd prefer to accept the degradation. "X racial subgroup is better/worse in some way than y racial subgroup" is one of the unnamed Things You Can't Say and I see no need to censor it here, even if the discussion makes me uncomfortable.
It is informative to know how other people think about these things, so you have a point. I do worry, though, about what type of people will be attracted here by this type of meme.
You may be right. It may not (yet) be possible to have a sincere public discussion that isn't drowned out by PC ideologues on one side and racists and xenophobes on the other. It's not always easy to tell who's who, either: sometimes uttering "what you can't say" is an act of courage, sometimes it just means you're an asshole. Intentions and emotions are part of this, and they're harder to read outside the personal sphere.
We should do everything we can to keep out these immigrants.
Edit: I almost didn't post this because people are being so sensitive today. But you're a tough guy. :)