Have you ever considered why stoning was the means of execution in the First Covenant? It was a means of public testimony that the one casting a stone was in agreement that the one being stoned had indeed broken God’s laws.
If a stone was NOT cast then the one not casting the stone was saying that the offender did no wrong. Just as we are to publicly warn others through our speaking that what they are about to do or are doing is an abomination to God, and in so doing exonerate ourselves in God’s eyes. Silence is acquiescence.
In God’s eyes this governor is participating in this child’s murder, yes?
Good point, God didn’t want condoning of wrong. This is true in Christianity too in declaring and making someone not a member of your church. It may seem harsh in the OT times, but then again, you also had God kings promoting evil then too.