He's trying to "understand" what makes Osama bin Laden, Al Queada and the Taliban such bad guys. Hitchens does his best to explain without just calling old Mos a moron.
http://www.youtube.com/watch?v=tKwziTJfMbg&feature=player_embedded
Mos Def may have gotten an answer to his question but the guy NEVER shut up. How many Mountain Dews did he drink before the show?