During a moment of severe crisis, Jonathan steps forward as a mediator between his father, King Saul, and his hunted friend, David. Seeking to prevent bloodshed, Jonathan appeals to his father using both moral reasoning and clear logic, pointing out David's deep loyalty and immense contributions to the kingdom.
The primary approach among commentators is that Jonathan simply spoke in David's defense, emphasizing his good qualities. However, a different perspective suggests Jonathan used a clever psychological tactic [מלבי״ם]. Knowing his father's state of mind, Jonathan initially spoke poorly of David, framing him as a reckless person who needlessly throws his life away. This negative assessment pleased Saul and earned his full attention. Only after securing his father's ear did Jonathan skillfully turn his argument to defend his friend.
Jonathan warns his father against the grave sin and moral injustice of killing an innocent man [מצודת דוד, אברבנאל]. He carefully describes David in a way that highlights two distinct virtues. First, David is a completely loyal servant to the crown. Second, he is a great and wise man who has God with him. Because God is with him, harming David would not only be unjust, but also incredibly dangerous for Saul himself [חומת אנך].
Building his case, Jonathan presents a twofold argument regarding David's actions. He points out that David has done absolutely nothing against the king, while also noting the tremendous benefit David has brought to Saul through his music and military successes [מצודת דוד, ביאור שטיינזלץ]. Jonathan gently addresses the root of Saul's jealousy. Even if Saul felt hurt when the women sang praises of David's military victories, David himself committed no offense. When he faced Goliath, David acted purely out of self-sacrifice to honor God, ultimately bringing a great salvation to the Israelites [חומת אנך, אברבנאל].
Through this defense, Jonathan brings his argument full circle. The very recklessness and willingness to risk his life that Jonathan initially presented as a flaw is revealed to be David's greatest advantage—a quality that perfectly serves Saul's own goals without causing the king any harm [מלבי״ם].