My tentative view is that the general exclusion of marks that disparage persons, institutions, beliefs, or national symbols should be seen as unconstitutional. Trademark registration, I think, is a government benefit program open to a wide array of speakers with little quality judgment. Like other such programs (such as broadly available funding programs, tax exemptions, or access to government property), it should be seen as a form of “limited public forum,” in which the government may impose content-based limits but not viewpoint-based ones. An exclusion of marks that disparage groups while allowing marks that praise those groups strikes me as viewpoint discrimination. But I’m not sure that courts will ultimately see this my way; so far they haven’t been inclined to do so, precisely because the exclusion of a mark from federal registration leaves people entirely free to use the mark.