No, I can't, but I have seen letters to the editor in WSJ doing it. (There might have been editorials on these topics, but probably not as strongly worded as this article.) I'll concede your point, though.
I do think however, that what we're seeing is a social taboo that is not limited to white vs black issues and is only vaguely related to the white guilt thing. Have you ever heard non-Jewish comedians tell jokes about Jews? (I know there aren't many of those!) Do we need other examples? There may be jokes about Italians or other ethnic groups, but serious discussions of such groups' internal problems are not allowed, unless the speaker/writer is a member of the group. I even suspect this type of taboo is common in other countries.