The ideology of Brian Thompson’s murderer was a topic of intense speculation even before a suspect was named. After the UnitedHealthcare executive was shot in midtown Manhattan last year in December, law-enforcement officials said they’d found a message at the scene of the crime: shell casings inscribed with the words deny, defend , and depose , a twist on the phrase often used to describe health insurers’ delaying payment to customers, denying claims, and defending their own actions. When Luigi Mangione was arrested days later, prosecutors on both the state and federal level jockeyed to charge him, and the Manhattan district attorney’s office zeroed in on Mangione’s politics. The office hit him with 11 counts including two counts of murder as an act of terrorism, arguing that becaus

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