A former rebel commander known throughout Liberia as Gen. Butt Naked has returned to the nation his troops terrorized to confess to the killings of thousands. Milton Blayee, who now lives in Ghana, returned this week to acknowledge before the country's truth and reconciliation commission that his men killed 20,000 Liberians. An estimated 250,000 people were killed in Liberia's on-and-off 14-year civil war, which ended in 2003. Its truth and reconciliation commission, modeled after the one in post-apartheid South Africa, has been airing the worst of the abuses in a war characterized by the eating of human hearts, the use of child soldiers and the colored wigs and costumes worn by intoxicated rebels.