ONCE UPON a time, we had a great wartime president who told Americans they had nothing to fear but fear itself. Now we have... Bush, who uses fear as a tool of executive power and as a political weapon against his opponents. Franklin D. Roosevelt tried his best to allay his nation's fears in the midst of an epic struggle against fascism. Bush, as he leads the country in a war whose nature he keeps redefining, keeps fear alive because it has been so useful.