We're told, these days, that the situation in Darfur is not as simple as we supposed a year or two ago. There, too, ambiguity. But it is not acceptable to be immobilized by ambiguity, not when women are being raped, children starved, people driven from their homes, routinely slaughtered. Much of life is inherently ambiguous. Yet, if not now, when? Else it will never end.