The following memo was left on the doormats of residents of Penn South, a 3,000-unit cooperative development located near Madison Square Garden. The city, already addled by 9-11, prepares for the inconveniences the convention will bring. Being told by the management to “If at all possible, stay inside during the times the convention is in session” is just the latest in a series of infringements that have come to define life in the city. What’s interesting is how closely these suggestions mirror hurricane or tornado safety tips (“Be sure to shop for extra food and water . . . “), leading one to wonder, what hath god—and Mayor Bloomberg—wrought, and what the hell did we all do to deserve it?