Since liberals started making a national controversy of involving the e-mail Harvard law student Stephanie Grace wrote (which was forwarded to a black group by Yelena Shagall six months later) in which she stated their was a possibility of blacks having a lower average intelligence than whites, I've attempted to argue on various liberal websites about this topic, with no success at all. Instead, I discovered that liberals do not even want to touch this topic. On pretty much every issue from healthcare to abortion, liberals relish a debate with right-wingers. But when it comes to racial differences in intelligence, liberals' only goal is to shut their opponents up.
A lot of the comments I made arguing point that racial differences in intelligence were simply deleted from various blogs and websites. Those that were not were usually met with comments simply calling me (and others who attempted to debate the issue) a "racist." Indeed, one liberal commenter at Above the Law responded to a multi-paragrah comment I made by writing that most of what I wrote was worthy of argument due to fact it was "racist." Unlike when they discuss black crime, they don't even bother with their standard explanations for black deficiency - slavery, Jim Crow, poverty, institutionalized racism, etc. They just say that the idea of racial differences in intelligence is just so racist that it's not even worth debating.
Another common response from liberals to people who discuss race and intelligence is that if you're not a scientist, you can't say anything on race and intelligence (another liberal at Above the Law responded to my comment this way). The requirement to be a scientist to discuss science, naturally does not apply to liberals. Otherwise, we couldn't have the joy of reading journalism majors inform us of how global warming will destroy the planet if we don't give the government more power. Likewise, this does not stop sociology students who do not know the difference between circuit-switching and packet-switching from calling for "net neutrality," nor does it prevent liberal arts majors who don't know what the "broadband" in "broadband Internet" means from criticizing the recent court case limiting the FCC's regulation of broadband Internet companies.
The reason for the liberals' absolute refusal to even debate this topic is obvious: they've seen the statistics and understand that it's pretty much impossible to refute the results of pretty much every test that measures intelligence or a function of it. If they had to acknowledge that there were racial differences in intelligence, then that means egalitarianism is founded on a lie, which means their entire worldview is essentially incorrect. Thus, it's easier for them just to call their opponents racists and move on. Ignorance is bliss.