The warnings not heeded in New Orleans must teach other cities about the need to prepare for the worst New Orleans is about to be flooded by recriminations. No levee is strong enough to hold back the wave of blame for the neglect of the city's protective barriers, the failed disaster plan and the slow, haphazard rescue effort. You can already see it coming, just as experts long warned that a Category 4 hurricane like Katrina could breach the earthen levees around New Orleans and flood much of the city. The challenge now is to channel the anger and frustration...