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"And that someone could turn murder into something so grotesquely recreational, like he was sending souvenirs from hell. So, lunch buddies, I can't tell you what drives someone to do something like that. Narcissism. Control. Or some deeply seated desire to be remembered in a twisted way. Later, killers have followed in his footsteps, such as BTK and others have tortured families of people they've killed with calls and letters. So maybe it's just a low impact exercise of cruelty."