You are confused as usual. The meeting out of God's justice to guilty sinners (which is all that Moses did) is not a violation of the commandments it is the judicial enforcement of them. The people whom God (not Moses) judged, regularly practiced and participated in things like ritual child sacrifice and bestiality just for starters. You have previously admitted that God is justified in judging guilty people. There is no contradiction between God's love and God's justice, God is glorified in His expression of both.