Republican members of Congress haven't yet done enough to get to the bottom of problems surrounding the response to Hurricane Katrina. Only an independent inquiry can do that. But at least they recognize a fool when they see one. Michael Brown, who quit as director of the Federal Emergency Management Agency after Katrina, was back on Capitol Hill on Tuesday, defending his response to the hurricane that killed more than 1,000 people and left thousands more trapped in the floods, cesspools and crime that followed. He blamed everyone in sight except, of course, himself. New Orleans Mayor C. Ray Nagin....