The answer is: Joab

2 Sam 3:26-30 - Joab thought Abner was a spy

In the unfolding drama of 2 Samuel, we see the tragic tale of Abner’s death permeated with themes of loyalty, vengeance, and political intrigue. Joab, seasoned general and nephew of King David, was deeply influenced by personal alliances and betrayal throughout his military career. Although Abner was pivotal in uniting the tribes of Israel under David, Joab mistook his actions as treachery, leading to lethal consequences.

Interesting context reveals that Joab’s motivations weren't entirely rooted in revenge; he felt Abner posed a threat to his own authority. In his world of shifting alliances, military strength—and the perception of loyalty—were paramount. Rather than confronting David about his reservations regarding Abner, Joab took matters ruthlessly into his own hands, reflecting a darker side of warfare deeply woven into the narrative of leadership in those times.

It's fascinating to think about how Joab’s actions continue to resonate through history, perhaps echoing the age-old adage that trust, once broken, can spur dangerous cycles. In the grand narrative tangle of the anointed kings, the fratricidal chaos that ensued never played out exactly like a fairytale—even among heroes.

In essence, while Joab's justifications might have seemed fitting in a warrior's worldview, the outcome serves as a cautionary tale about the consuming powers of jealousy and distrust. Every choice leaves ripples in the fabric of history, pivotal and profound, shaping legacies in ways neither he nor David could foresee.