What should society do for "uncivilized cultures" like the Sawi?

Six million Jews. Slaughtered heartlessly. The Holocaust was an atrocious genocide lead by Hitler in attempts to wipe out any race "inferior" to their own. Hitler surely must have been a psychotic, blood-thirsty killer sent from the devil. However, if we think about it, we may also not be too different from Hitler. Uncivilized cultures like the Sawi can seem so evil and abhorrent in our eyes because of their wicked practices such as cannibalism and deceit. Some people may think that it would be best just to wipe these tribes off the face of the earth and prevent anymore wicked cultures to form. If we allow this to happen, not only are we any different from the German "psycho", but we are also taking away their chance for redemption which has not yet even been offered. Tribes like the Sawi have not been given a chance to know what the concept of redemption even means. If we allow them to continue on with their wicked culture, nothing will ever change. So it is up to us to bring the change. It is up to us to reach out to them and teach them, based on God's Word, on the correct way of living. It is up to us to shine God's love through our own actions. Without God's Word, they are hopeless. We have to be the ones to share that hope.