You're focusing on the triggers. But at heart of this - is the fact that Burundi and Rwanda - are very tiny countries that are perhaps the most populated in Africa - it's like Gusii or Vihiga on steroids - and you got a few rich tutsi owning huge chunk of land where they raise cattle- in every village - and the hutus - are stuck there with very little farm land. Rwandese & Burundus are very poor - finding them having 3 meals a day is unheard of.
People who've lived together for centuries....speak one language and inter-marry....cannot suddenly kill themselves because of just propaganda.
The problem is Bazungu bringing their medicines and Africans subsequently breeding like rats - causing resources shortages.
You are crazy. You must be the only "expert" that thinks this was over resources