I don't get the point or the tone of this.

From Andrew Sullivan. That looks like racism -- really old-fashioned racism. If you think you've found a serious economic study that has some connection to present day policy, add some substance to the post and justify bringing up this disturbing subject. This is not material for a silly post put up for laughs and what seems to be a triumphant reference to an earlier assertion. What's going on here?

ADDED: And I'm not asking for an explanation of the humor in the video. I'm asking how Sullivan could think the news of a study that appears to support a racist stereotype should be met with a blog post like that featuring a comic video. The tone seems all wrong to me.