Elton John's song 'Shoulder Holster' delves into themes of conflict, protection, and vulnerability. Through the use of metaphorical language, the song explores the idea of carrying emotional burdens and the armor people wear to shield themselves from pain and adversity. Key themes include the struggle between aggression and defense, the complexities of relationships, and the human tendency to prepare for battles both external and internal. Poignant moments in the song highlight the inner turmoil of the protagonist as they navigate the delicate balance between self-preservation and openness.