Little over a week after this mostly white suburb became a symbol of callousness for using armed officers to seal one of the last escape routes from New Orleans — trapping thousands of mostly black evacuees in the flooded city — the Gretna City Council passed a resolution supporting the police chief's move. "This wasn't just one man's decision," Mayor Ronnie C. Harris said Thursday. "The whole community backs it." Three days after Hurricane Katrina hit, Gretna officers blocked the Mississippi River bridge that connects their city to New Orleans, exacerbating the sometimes troubled relationship with their neighbor. The blockade...