The recent crash and fatality and fire last week in a Model X is being heavily investigated and TSLA short sellers are using it to incite a panic and worsen the price correction in stock price.
A few facts:
The crash occurred at high speed into a concrete barrier where the crash attenuator was not repaired. It's like driving into a tree at high speed. Depending on the speed, it may be impossible to survive that type of crash in any vehicle.
Despite multiple pictures of the fire that consumed the Model X afterwards, it appears from witness reports that the driver was already removed from the vehicle which was empty by the time the fire became dangerous.
It may not be possible to find out if the car was on autopilot due to the extensive damage from the crash and the fire. The logs may have been destroyed but Tesla and all of the government agencies investigating will do everything possible to recover the data.
Having worked in NYC EMS for many years, I know that drivers can become ill or incapacitated while driving thereby precipitating a crash. The driver was only 38 years old but I'm sure the full investigation will address all possibilities.
Tesla's Blog post: https://www.tesla.com/blog/what-we-know-about-last-weeks-accident