XKCD Doesn’t Understand Free Speech — or The Difference between Legal and Moral Rights

Fans of censorship are fond of this XKCD:

The mouseover text for that XKCD: “I can’t remember where I heard this, but someone once said that defending a position by citing free speech is sort of the ultimate concession; you’re saying that the most compelling thing you can say for your position is that it’s not…