ISTM that while the severity of the damage and the fatal injury are specific to the Model X, now that Tesla has confirmed that the car was under the control of A/P at the time of the crash, that discussion belongs in either the "Autonomous Vehicles, Leaf and others" or "Tesla's Autopilot, on the road" topics. It's as yet unclear whether this crash was due to some problem specific to Tesla or was more generic to AV systems. Now that companies other than Tesla have vehicles with some AV capability out in the real world and such crashes will become increasingly frequent, I think the general AV topic is the correct one, and I'll be posting any further news/comments related to the causes of this accident there, along with those relating to the Uber accident, legal fallout, etc.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].
The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.