With respect to the Nazis, Hannah Arendt noted that they were as frank as they were mendacious — that no-one should have been surprised by the Holocaust because the Nazis had been talking about such things for years. Western liberals dismissed it all as rhetorical. The same was said about the things the radical Islamists have been writing about for decades. And have you looked at some of the stuff coming from other fringe groups? There is a lot of hate in the world, and it behooves the people who seek to defend civilization to keep an eye on it. Those who would be convinced by reading bin Laden’s writings are already lost causes — and anyway they are widely available on the web to those who want to find them.