The immune system's tendency to attack its own tissues may stem partly from a previously underappreciated cellular defense mechanism gone awry. While researchers have long focused on neutrophil DNA traps in autoimmune conditions, emerging evidence suggests macrophages deploy similar chromatin-based nets that may be equally destructive to healthy tissue. These macrophage extracellular traps, or METs, represent web-like structures that macrophages cast into surrounding tissue, originally evolved to snare pathogens. However, these DNA scaffolds inadvertently expose a dangerous catalog of self-antigens, including modified histones and mitochondrial genetic material, potentially triggering the autoantibody production characteristic of rheumatoid arthritis, lupus, and vasculitis. The research consolidates preclinical and clinical findings showing elevated MET burden correlates with autoimmune disease severity and organ damage across multiple conditions. This suggests METs function as more than innocent bystanders—they actively amplify inflammatory cascades and sustain nucleic acid-driven immune responses that characterize autoimmune pathology. The mechanistic link between MET formation and classic autoantibody responses like anti-citrullinated protein antibodies and anti-double-stranded DNA provides a unifying framework for understanding seemingly disparate autoimmune conditions. From a therapeutic perspective, this paradigm opens three distinct intervention strategies: preventing MET formation, accelerating their clearance, or blocking downstream DNA-sensing pathways. However, any therapeutic approach must carefully balance autoimmune suppression against preserving essential antimicrobial defenses, since these same trapping mechanisms protect against genuine infections. The field now requires standardized protocols for identifying and measuring METs to advance from promising laboratory observations toward viable clinical interventions.