Fair enough -- I agree that's a valid counterexample to my thesis. (I do think, however, that you overestimate the amount of principled support for free speech in the contemporary U.S. For many of its defenders, it's a matter of strategic expediency, since they are not confident that, if speech-restricting precedents were established, their side would win the subsequent political battles over whose favored speech restrictions would get instituted. In particular, many prominent ACLU-affiliated people don't seem to have any problem with the existing speech restrictions in places where their co-ideologues are firmly entrenched in power, even though they wouldn't want to establish a legal basis for such restrictions in the U.S., at least for now. But I do agree that this is one issue where there is some serious weight given to libertarian principles in the mainstream discourse.)

(I should maybe also add that I don't live in the U.S., which is a pretty extravagant outlier when it comes to the attitudes and legal norms regarding free speech, so the example didn't occur to me readily.)

That said, I still think my comments are valid when it comes to the issues of sexuality, marriage, etc. Here I really see an ideological clash fundamentally motivated by incompatible sacredness norms, with all other considerations, including libertarian principles, entering the debate only insofar as they provide useful rhetorical ammunition.

This seems exaggerated to me (although I agree that the tendencies you mention exist and are significant). Consider, for example, the famous incident in which the American Civil Liberties Union defended a Nazi group's right to demonstrate. The ACLU was and is a non-fringe organization, and likewise, the position that "Nazism is despicable, but freedom of speech and assembly is more important than silencing Nazis" is reasonably mainstream in the United States.

There's not much danger of the Nazis convincing non-negligible numbers of people, so this is a cheap way to signal one's support for freedom of speech. Call me when the ACLU is interested in protecting the right of pro-life groups to demonstrate outside abortion clinics.

Similarly, the idea that "Drug use is bad, but marijuana should be legal" seems not-uncontroversial but also non-fringey.

My understanding is that most of these people actually hold the position that "use of certain drugs is bad, but marijuana isn't one of those drugs".