Is freedom of expression a principle worth defending?
Christopher Hitchens strongly disagreed with such people, and one of his virtues was that he was exceptionally effective at cutting through their obfuscations and moral evasions and calling them to account. Nick Cohen just retrieved and posted a video clip of one such occasion. It's an admirably clarifying and exhilarating blast from the past. Hitchens is no longer with us, alas, but his voice is still there.
(Hitchens's main intervention in the discussion, in response to an opening statement by Shirley Williams, runs from about 1:08-3:11. But he comes back again at 7:53 to add some very important points.)