I think you are forgetting one large element in all of this:
Humans design computers.
Until computers are designed purely by Lord God Buddha, Allah, Jehovah or whatever takes your fancy then the they will ALWAYS be subject to the same human errors that cause pilots to crash aeroplanes.
If aeroplanes still crash when there is NO pilot on board then which scenario do you think the general public will trust - a computer or a human controlled aeroplane.
Lots of engineers on the ground alone cannot fix an airborne problem - where is the resilience in the system without the expertise of a specialist at the source of the problem?