That's why nothing was done in Rwanda to stop the genocide of nearly a million. They were letting the people thin out the excess of humans.
Man's ingenuity for mass murder is unprecedented.
Now the same thing is happening in the Sudan. The US has asked the UN over and over again to intervene (they are observing right now), but to no avail.
The Sudan is valuable to the Chinese for their oil, the fewer sudanese people there are, the easier it is to purchase the oil contracts.