13:21 Wroth - With Amnon: whom yet he did not punish, at least so severely as he should either from the consciousness of his own guilt in the like kind; or, from that foolish indulgence which he often shewed to his children.
13:21-29 Observe the aggravations of Absalom's sin: he would have Ammon slain, when least fit to go out of the world. He engaged his servants in the guilt. Those servants are ill-taught who obey wicked masters, against God's commands. Indulged children always prove crosses to godly parents, whose foolish love leads them to neglect their duty to God.
