At the end, I was glad that I went to my church, even though late (I wasn't the latest, as it happened). The sermon was on Deuternomy 19 and 21:1-9.
The uninformed often refer to 'the God of the OT' as being a retributive God, unlike Yeshua. But not so: the Torah provides a law that limits death to the most serious of personal crimes (not property crimes, unlike most cultures until modern times), and even then provides for doubt.
One crime that is often brought up is neglect of parents (lack of respect): this arguably refers to adult children not caring for their parents, inflicting their care on others. In a tribal society this is tantamount to killing one's parents. Thus the penalty.