I know we aren’t seriously considering this, but planes crash for a variety of issues but human error is definitely a factor in a number of them. Some reading if you’re interested:

Single human errors don’t generally cause accidents for a variety of reasons, but significant levels of redundancy help. Accidents happen because mistakes build on mistakes.

https://en.m.wikipedia.org/wiki/Chain_of_events_(accident_analysis)

This is an example of one type of human error chain related accident. Could be caused by a variety of things, but this shows that the plane in these cases has basically nothing to do with the accident. All human error.

https://en.m.wikipedia.org/wiki/Controlled_flight_into_terrain

Thanks for coming to my TED talk.