system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Rwanda's genocide, Hutu and Tutsi?
gpt
The roots of the genocide can be traced back to Belgian colonization. In order to control large amounts of people with a small number of colonists, the Belgian government looked to take advantage of the existing Congolese leadership.  

At the time, our modern concept of tribe's did not exist in Congo, so following after their British and French counterparts, the Belgians forced it upon the locals. They slowly began labeling the large group of farmers in the region Hutus and the herders Tutsis.  They put the relatively wealthy, but far lass numerous Tutsi in positions of power over the Hutu as a means of controling to populace.

Fast forward to the 90's and this power structure is still in place decades after the Belgians left and its failing. Spurned on by economic hardship and instability in the region the masses of Hutus looked for a scape goat for their suffering. They blamed the Tutsis.   

Close to 1,000,000 Tutsi and moderate Hutus were killed in 3 months primarily with hand tools (read machetes and clubs). They were singled out over the differences the Belgians invented decades ago (think Nazi eye charts).

Today Rwanda is more stable than many of its neighbors. Although there are numerous systems in place to try perpetrators of the genocide, its hard to truly say who participated and who didn't. Most of the killers will never see justice in their lifetimes. Although the killing has stopped in Rwanda the ethnic violence has spilled over the boarder into the DRC and is used as a motive for various rebel factions to kill each other for control of natural resources contributing to the "African World War" which has taken more lives than any war since World War 2.