Wall Street Journal (Europe) June 21, 2006  With Friends Like These By Yves Roucaute The old Continent is wilting in the global war against terror, just as it did when faced off against fascism and then communism. When at today's summit with U.S. President George W. Bush the European Union will once again take its ally to task over Guantanamo, it will expose its own, not America's, most serious moral crisis of the post-Cold War era. A philosopher -- a French one no less -- can try to set the facts straight and offer some Cartesian good sense. Faced with dark forces that want to destroy our civilization, we might recall that the U.S. is not only