You know - for years I had a problem with verses in the Old Testament where God said to do exactly that - not that I doubt God - but what a heavy task. Then I realized, believe it or not, after seeing Taken 2 (yes, the Lord taught me something from that movie) - of the desire of the descendants or families to avenge - that God was saying “Kill them all and I’ll make the Righteous Judgments” - which only HE can do.