You are joking, right? How many radical Muslim hate preachers have been arrested already? It seems to me it was at least one every month.
As I see it, there is a double standard against Muslims. Bashing Muslims and holding them all responsible for the deeds of a few among them, in a generalizing broad-brush manner, has become mainstream. Islamophobia and blatant anti-Muslim hatred are the new anti-Semitism. In many countries, it has become perfectly acceptable. Polls show numbers between 30% and 50% of the native populations are bigoted Muslim-haters. Muslims are target of racial profiling and general suspicion in the "war on terror". And that's not even mentioning every day racism. If the same discrimination was common against Jews, people would rub their eyes, but for some reason, it's perfectly acceptable when Muslims are the target.
For the record, that doesn't mean, of course, there are no problems with Muslim extremists, or backwards attitudes among Muslim immigrants. Of course there are. I just don't believe that broad-brush condemnations, incitement and discrimination are a constructive way of dealing with these problems.
As I see it, the problem with extremist islamism is minor, ridiculously minor compared to the problem of native xenophobia and anti-Muslim bigotry. Hell, Muslims haven't even founded a party in any Western country, which demands the introduction of Sharia, or anything of that kind -- while xenophobic anti-Muslim hate preachers win up to 20% in elections.