There's an old well worn adage by computer engineers that still holds since computers were invented and it goes like this:
"We put the bugs in the system."
So why carp on about all the "what-if's"?
The software is never perfect - only tested to a common standard.
The plane is never perfect - only tested to a common standard.
Just as well Cpt Sullivan being ex US Mil had seen imperfection in aircraft before and was the smoothing interface between a smoking hole in the ground and a safe return for all.
And to think some people want to remove that filter out of the flying equation.