(Bloomberg View) -- Almost as soon as news broke of a fatal crash involving Tesla's Autopilot last year, fans and detractors of the electric-car manufacturer have been clear on the tragedy's causes. Tesla's supporters and investors have never doubted that the system improves safety, so the driver must have failed to heed Tesla's warnings and remain attentive. Detractors and short investors, on the other hand, have been all but certain that Autopilot somehow failed to protect the car's driver, allowing him to drive directly into a semi at 74 miles per hour.

After more than a year of debate a conclusive answer is finally at hand, courtesy of a National Transportation Safety Board investigation whose final results were presented this week. But the board's findings aren't likely to leave either side happy: Rather than blaming man or machine alone, it seems that both human drivers and the Autopilot system -- specifically the complex relationship between the two -- contributed to the deadly event.

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