Genocide is not only the mass murder of a population based on a fundamental part of their character; it is the intention to annihilate an entire population. It's a promise by radical extremist that once the "undesirables" are eliminated the societal problems they are struggling with will vanish as well.
Genocide, the podcast, uses the stories of survivors and experts to not only tell the story, but also consider how a large number of people were compelled to murder their former friends and neighbors... including children and the elderly... every member of the class unworthy of life was to be killed.
They didn't succeed in their goal of wiping out the entire population of the Tutsi people during the genocide - there were survivors. The Hutu, the oppressors, were manipulated by a few high ranking radicals, but they eventually lost power. In fact the leader of the party fighting to end the genocide is still the current president of Rwanda.
In one hundred days a million people were murdered. The Hutu people, united by the hate that had been indoctrinated with, didn't use guns or other weapons of mass destruction to kill the Tutsi and the moderate Hutu who helped the Tutsi. They were armed with clubs and machetes - they beat, sliced, and hacked innocent people to death - because of their social class and how many cows they owned.