The two greatest factors that contributed to the spread of disease among civil war soldiers were that they were in extremely close quarters, and that there was no medicine that could kill the germs in question.
The Rwandan Civil War was between the Hutu's and the Tutsi's.
The Hutu's made up a large majority of the population. However, a Hutu Manifesto published in the middle of the 20th century claimed that the minority group of the country (the Tutsis) were manipulating and controlling the government. Essentially, they were blaming the Tutsi for the problems in Rwanda. This helped lead to the Rwandan Civil War and the Rwandan genocide.
There were no longer any special privileges for Nobles, Churchmen or rich people