Has it really changed?

Genocide is generally defined as the intentional extermination of a specific ethnic, racial, or religious group. Compared with war crimes and crimes against humanity, genocide is generally regarded as the most offensive crime. At worst, genocide pits neighbor against neighbor, or even husband against wife. Unlike war, where the attack is general and the object is often the control of a geographical or political region, genocide attacks an individual's identity, and the object is control -- or complete elimination -- of a group of people.

The history of genocide in the 20th century includes:
the 1915 genocide of Armenians by Turks;
the attempted extermination of European Jews by Nazis during World War II;
the widespread genocide in Cambodia during the 1970s;
the "ethnic cleansing"[1] in Kosovo by Serbs during the 1990s;