When discussing—and, in this case, defending—radical Dutch parliamentarian Geert Wilders, it is de rigueur to begin with emphatic caveats and disclaimers. Mr. Wilders, a fulminating critic of Islam and advocate of closing Holland's borders to further immigration, is something of an extremist, a man with whom most will find difficulty attaining common ideological ground. The Koran, he says, is a Hitlerian text ("Ban that wretched book like Mein Kampf is banned!"). To those who contend that radical Islam is the problem and moderate Islam is the solution, Wilders scoffs: "Moderate Islam does not exist." Mohammad, he says, was a "terrorist" and "war-criminal." And so on.