Full article at: http://www.cbc.ca/news/technology/virgin-galactic-didn-t-prepare-for-human-error-ahead-of-spaceshiptwo-crash-ntsb-1.3171381
"And even the best-trained human on their best day can make mistakes." So very very true. That is one of the reasons I want to get autopilot.
It's exactly the same sort of issue as unintended flap deployment in aircraft, with pretty much the same result (structural failure). There are ways to mitigate the risk. Presumably Scaled Composites has learned from this, and will have a look at other onboard systems to make sure other commonly-known failure modes are addressed.
Here's the video of the mishap from the NTSB. It doesn't show the actual breakup (thank goodness), but you can see it pivot and pitch up quickly around the 35 second mark. [video]https://youtu.be/Qv8Y0aMNix8[/video]