“And Amnon was so tormented that he made himself ill because of his sister Tamar…” (v2). David’s sins of lust and violence were mirrored in his family. Amnon was “tormented” (v2) by lust and “violated” (v14) his half-sister Tamar. Amnon’s aggression and the inaction of David (he merely gets “angry,” v21) lead to a great rift in the family, as Absalom nurses his anger and plots revenge (v22).
“Do not do this outrageous thing” (v12). Sin is more than an individual issue. What we do or don’t do affects those around us, sometimes for generations. To flee sin is to bless our families and communities.