As David flees from his own son, a bitter curse connects his tragic downfall to his past actions against the house of Saul. The divine punishment unfolding against him operates as a strict measure for measure, yet it carries a severity far greater than what his predecessor ever endured. God is demanding a price for the blood spilled within Saul’s family. Commentators trace David's alleged involvement in the destruction of Saul’s dynasty through various events. Some suggest that David actively advised the killing of Saul's son, Ish-bosheth, in order to seize the throne [מצודת דוד]. Taking a broader view, others hold David responsible not only for the deaths of Abner and Ish-bosheth but also for the deaths of Saul and his three sons in battle. This is because the massacre David inadvertently caused at the priestly city of Nob set into motion the tragic end of Saul's lineage [אלשיך]. The fundamental charge is that David rebelled, orchestrated the collapse of Saul’s kingdom, and took the throne for himself [ביאור שטיינזלץ, אלשיך].
In this unfolding tragedy, three great evils strike David, highlighting how his current state is far worse than the fate suffered by Saul [אברבנאל, מלבי״ם]. First, just as Saul's family became a house of blood when his sons died by the sword, God is turning that bloodshed back upon David. His own sons are destined to die by the sword, a curse that already began with the death of Amnon. Second, the loss of the kingdom is deeply personal. While Saul was replaced by an outsider, David suffers a much more painful blow because the rebellion erupts from within his own home, led by his own flesh and blood. Furthermore, the kingdom is not simply taken by military might, but stripped away by God Himself, the very source of David's trust. This specific punishment of being driven into exile by his son is seen by some as an atonement for his past sin with Bathsheba [אלשיך].
The third great evil is the inescapable reality of his suffering. While Saul did not live to see his ultimate downfall or a new king rise in his place, David is forced to witness his own ruin, shame, and distress while fully alive, receiving the exact hardship his actions deserve [מצודת דוד]. The root cause of this relentless fall is his history of bloodshed. He remains caught in his wrongdoing and its resulting punishment [ביאור שטיינזלץ]. Even though the rebellion itself serves as a penalty for the sin of Bathsheba, the heavy guilt of spilled blood has not yet been washed away. Consequently, David is left vulnerable in his misery, facing the terrifying threat that his own son might kill him [אלשיך].