Then you haven’t checked. They certainly kill each other and are at constant war.
Most “wars” in Africa are localized uprisings, and it is astonishingly rare for those conflicts to cross over international borders the past 40 years. The vast majority of the deaths the past few years were due to religious wars like the Islamic rebels in N. Nigeria, the Islamic attacks against Christian S. Sudan, uprising in DR Congo and the usual mess of Somalia.
WW2 in E. Europe alone still dwarfs the scale of any of those.
You seem to have this fixation about white Europeans being the most “destructive” forces in history.
Ever here of Genghis Khan? I think he’s the champ for world wide destruction..... by a mile.
What kept the African Continent from advancing further than the Europeans, since everyone is “equal”?