Many people fear that a vacuum could open up when the rebels leave, and that the Congolese Army could be even worse.When Congolese troops hastily retreated from Goma last week, Mr. Nunn said, ???there was a lot of rape, a lot of insecurity, a lot of extortion and some killings.??????It was a mess, and people are worried about the same kind of thing happening when they come back,??? he added.The de