Core Viewpoint - The shooting incident in Manhattan has sparked significant public interest in the topic of "chronic traumatic encephalopathy" (CTE) related to American football, particularly in light of the shooter's motivations and background [1][3]. Group 1: Shooter's Background and Motivation - The shooter, Sean Tamura, left a handwritten note requesting research on CTE, indicating a belief that the NFL is aware of the dangers but chooses to ignore them for profit [3]. - Tamura had a history as a high school football player but did not pursue a professional career, and he traveled across the country to target the NFL headquarters in Manhattan [4]. Group 2: CTE and NFL's Response - CTE is linked to severe emotional and cognitive issues, with studies showing that 91.7% of deceased football players exhibit brain changes associated with the disease [3]. - The NFL has historically denied a connection between football and CTE, only reluctantly acknowledging the link after a settlement with retired players in 2013 [3]. - Analysts suggest that the shooting will increase societal awareness of CTE and pressure the NFL to take greater responsibility for player safety and compensation [4].