Does 1 Samuel 15 show that God approves a nation to nuke an evil nation that wronged it?

God not only appears to approve nuking, but in addition, will punish those who disobey and do not nuke the enemies, that God wants to have destroyed,as this scripture shows God could easily destroy the enemies himself if he wanted so his telling man to do it is proper. The situation where moslem terrorists behead and slaughter people because of their nationality and faith, is not a situation where Jesus would have asked the victims to "turn the other cheek". Anyway, who today is not a sinner that can stand in the place of Jesus and demand that we "turn the other cheek"?