The film "Fitna" by Dutch parliament member Geert Wilders has created an uproar around the world because it links violence committed by Islamists to Islam.

Many commentators and politicians -- including the British government, which denied him entry to the country last month -- reflexively accused Mr. Wilders of inciting hatred. The question, however, is whether the blame is with Mr. Wilders, who simply exposed Islamic radicalism, or with those who promote and engage in this religious extremism. In other words, shall we fault...