I would say colonialism is a wonderful thing. It spread civilization to Africa. Before it they had no written language, no wheel as we know it, no schools, no hospitals, not even normal clothing.
Poor air quality, which can be influenced by a variety of fumes, chemicals and allergens, is arguably the leading cause of triggers for most asthmatics in urban areas.
The only violence was when these so-called 'freedom fighters' terrorized the poor Africans in the villages... They were told what to do and who to support.