That gruesome sight in December 2015 soon became a crime scene, one that eventually implicated six students and recent graduates of a prestigious Honolulu prep school whose alumni include former president Barack Obama. While on a camping trip the night before the hiker’s arrival, authorities alleged, the boys and young men had hiked to the Ka’ena Point Natural Area Reserve and mercilessly slaughtered at least 15 Laysan albatrosses, federally protected birds that have been the focus of a 26-year-long conservation effort. Nearly a dozen of their eggs were crushed; six other eggs failed to hatch due to the death of...