Well it's not like
Europe has a history of tribal violence. Viking, Goths, Spartans, they all have an undeserved reputation for violence. And of course with the coming of the Nation State Europe got busy civilising the rest of the world not engaging in a series of increasingly bloody continent wide wars.
Seriously, you don't have to blame colonialism for all of the continent's woes to find the "violence - it's just the African way/the problem is the Africans"* sort of thinking deeply disturbing.
*As expressed upthread not in the comment above. I consider guilt-based history to be stupid and unproductive.