KAMPALA, Uganda — Can Idi Amin be rehabilitated? The question is animating some in this East African country two decades after the death of one of Africa’s most infamous leaders. Amin, who took power by force in Uganda in 1971 and ruled until he was removed by armed groups of exiles in 1979, died in Saudi Arabia in 2003. His passing was barely acknowledged in Uganda, and some of Amin’s supporters…