The Africa controversy really confused me. What does everyone else think happened? That Superman shot a bunch of African mercenaries? Not exactly his style. And it sounded like there was some other stuff that happened off screen but it was all very confusing. If Lex's goons were trying to frame Superman, maybe they should have been using some prototype laser guns or something. But then Lois wouldn't have been able to find that mysterious bullet that led to her investigation subplot that went nowhere.
They think that Superman intervened in a critical situation and his presence (as well as killing that Warlord) scared the local government enough that things escalated into a massacre.