I am sure a lot of these accidents occur as you say by mistakes leading to mistakes and eventually pilot overload.
I right seated a pilot in a twin who got so stressed out on an aborted approach that when it was obvious we were not breaking out and the command go around was given just pulled the nose up, no power, no gear retraction, no flap retraction yet the pilot had carried out missed approaches in training.
The overloaded mind just freezes and pilots do strange things.
Pace