We've been having a bit of a debate over this sort of thing. We might not have a constitution with a First Amendment, but we still have a society where (within certain limits) citizens are free openly to express their views. So we have a small lunatic Muslim fringe, one of whom is quoted in the article: "The aim of everyone here today and all Muslims in the world should be to achieve martyrdom in the defence of Islam." There'll be a couple of letters in the Times today, I predict, from Muslims pointing out that this sort of thing is as twisted a take on Islam as the Crusades were on Christianity and that these guys are utterly unrepresentative of the vast majority of our Islamic population. Which, thankfully, is true.
At the risk of fanning a fire, I'd observe that it wasn't too long ago that the Irish Republican Army (a terrorist group responsible, inter alia, for the killing of 11 musicians just down the road from here when they blew up a bandstand in 1989) was largely funded by Noraid. According to their website (at
http://www.noraid.com), "Noraid is an Irish American support group registered and recognized by the US Government in good standing."
Freedom of speech, freedom of association and freedom to express one's ideas, whatever they may be, are part of being a liberal democracy. Would we rather live in Afghanistan, where the Taleban do their best to suppress any ideas, thoughts or expression which don't conform to their fundamentalist Islamic ideals?
Dave