The curse of oil

Here is a story with an easy ending to predict:

There are three bands of indigenous tribal people living in a pristine virgin rainforest in Ecuador. They are the Achuar, the Shuar, and the Kichwa peoples. The land is their ancestral home and has been legally designated as such.

Much of this land, it turns out, is believed to sit on huge untapped reserves of oil and gas.

The story

If tribes of oilmen can become rich by killing tribes of indians what do you suppose will happen?