Why does genocide occur in areas around the world? Please I need help in this question...

A century since the systematic slaughter of 1.5 million Armenians, and over half a century since 6 million Jews were killed in the Holocaust, mass atrocities continue to take place across the globe, without any sign of stopping. In March, human rights investigators for the United Nations disclosed that the Islamic State of Iraq and Greater Syria’s persecution and killings of Yazidis, a religious minority in Northern Iraq, appeared to be “clearly orchestrated” and gave cause for alarm at a probable genocide.

Because of power and wanting a change and to blame

Explanation:

Like the holocaust it cause the Jewish to die because of the Germans. The germans blamed the Jewish for their problems when clearly they did nothing wrong.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)