Does God help us behave morally according to this?

Num 31:14-1814Moses became angry with the officers of the army, the commanders of thousands and the commanders of hundreds, who had come from service in the war. 15Moses said to them, ‘Have you allowed all the women to live? 16These women here, on Balaam’s advice, made the Israelites act treacherously against the Lord in the affair of Peor, so that the plague came among the congregation of the Lord. 17Now therefore, kill every male among the little ones, and kill every woman who has known a man by sleeping with him. 18But all the young girls who have not known a man by sleeping with him, keep alive for yourselves.