These people that Israel was ordered to destroy were evil in a way that modern man (who has the luxury of living in a world that contains a huge number of people who have the Holy Spirit indwelling).
We think that we cannot coexist with radical islam or Progressives, but these tribes are those two tribes times a thousand! Israel could not move in nearby and expect to survive. Even if they didn’t attack Israel, their evil was so pervasive that it would have poisoned Israel with paganism and human sacrifice based religion.
Remember that at this point in human history, God had selected Israel to be the people who would introduce the one, true, living God to a world full of people that worshiped just about anything. They were not only the heralds, but they were destined to be the success story that would lead others to look at them and say, “Wow. Their God really is great.”
But to do that, they needed to clear the immediate area of these fundamentally evil tribes, and you can’t stress this one fact enough: we have NEVER seen people this evil in our world. Most of us can’t imagine what they were like because we can only imagine a world that has the Holy Spirit at work in people of all nations.
FWIW, Savange was camparing the latest iteration of evil to the Mongols and Huns. Seemed like a fair comparison.