pilot error happens all the time.
Yup, single-engine props to multi-engine jets.
[copilot]No, I thought YOU set the flaps.[/copilot]
And just sometimes, the flaps are INDICATED as 'down', but they're not
On the other hand, since nobody can truly explain why a flying wing doesn't just fall out of the sky, and the whole bird is 'fly-by-wire' like an Airbus, an electronic glitch can easily screw-up the control surfaces.
What I find amazing is that the ejection seats are so damned effective and reliable.
Even at 10ft altitude or upsidedown at less than 100 ft., when the user punches-out that thing GOES.