Sorry ruffy, I didn't see this until now. I think he did let the guy go and that is in turn why I have been saying all along that the coin toss just adds to his lunacy and doesn't really define him. Again though, I think its all a part of what makes a character like his so fascinating doesn't it? What makes a complete lunatic like Chigurh tick? How does one get so twisted? Dropped on his head as a baby perhaps? Or, and probably more likely he was born that way and he simply is what he is.
I agree--he probably let him go. Otherwise, if he kills him, he's got to kill the receptionist and everyone else he encounters leaving the building. He's already pushed the envelope beyond belief by being a Hispanic-looking male carrying a shotgun in the broad daylight in Texas during weekday business hours on city streets, into an office building, and up in an elevator without being challeged or at least reported by someone. Even in a small city with a few hundred thousand population like Odessa, Tex., something like that is bound to be noticed.
As for what makes and motivates a nutcase like that, it can be an injury or weird wiring from birth. The Texas gunman Clay Allison became ultra-violent after being kicked in the head by a horse as a young man. Apparently before the mishap, he was a normal person, but afterward he had a hair-trigger temper, especially when drinking, which he did often, and such a propensity for violence that even the Confederate army discharged him as being too violent. On the other hand, the most deadly gunfighter of them all began life as the pampered youngest son of a Methodist preacher who named him (first and middle names) for an early leader of that church, John Wesley Hardin. The rest of his family were good solid citizens; I think one of his brothers became a lawyer. I know at least one brother and I think maybe his father were lynched by a mob who couldn't get their hands on John Wesley after he killed a popular deputy sheriff, but that was much later in his career. Racial prejudice was one factor in Hardin's becoming a killer. He was too young to serve in the Civil War like his brothers, but he was in his teens with Reconstruction started in Texas. It's said that the first person Hardin gunned down was an unarmed black man shot for whistling "Yankee Doodle." Other of his early victims were black soldiers sent to bring him in. Despite spending many years in prison during his prime, Hardin was reputed to have killed more than 40 men. One was a stranger walking down the street who Hardin shot to "prove" he wasn't drunk; another was a man who was snoring in the adjoining hotel room. Hardin shot through the connecting wall to kill him.
I've had occasion to see cold-blooded killers in jails and courtrooms, including one real hitman for the Dixie Mafia, and the common characteristic I observed is that they were totally incapable of empathy with another human being. Their worlds were totally self-centered.
By the way, are you aware that Harrelson's father was a convicted contract killer? Killed a tough federal judge, known as "Maximum John" in San Antonio for a Mexican drug lord who was scheduled for trial in that court. The father was convicted in an open-and-shut case with a mountain of evidence marking him as the killer, but Harrelson (father and son) always claimed he was innocent. The son was working to get him out, but the old man died in federal prison.