LAST MONTH A CLASSIFIED UNITED Nations report prompted Secretary General Kofi Annan to admit that U.N. peacekeepers and staff have sexually abused or exploited war refugees in the Democratic Republic of Congo. The worst of the 150 or so allegations of misconduct--some of them captured on videotape--include pedophilia, rape, and prostitution. While a U.N. investigation into the scandal continues, the organization has just suspended two more peacekeepers in neighboring Burundi over similar charges. The revelations come three years after another U.N. report found "widespread" evidence of sexual abuse of West African refugees. "The issue with the U.N. is that peacekeeping...