As many accidents or near miss are put down to "Human Error", may I recommend some reading material? Published in 2006, so many of the concepts are now central to risk control but worth reading and challenging yourself in any case. The question to ask is not "why did they do that", but "why did that response seem to them to be the most appropriate one, given the information that they held at that time?"
The Field Guide to Understanding Human Error
Sidney Dekker (the author is a professor in this field, and a part-time pilot flying a Boing 737NG)
ISBN 978-0-7546-4826-0
Fascinating reading