At the risk of putting words in their mouth, they are comparing the method of airplane safety, where they look at redundancy (assume X will fail and the plane n

At the risk of putting words in their mouth, they are comparing the method of airplane safety, where they look at redundancy (assume X will fail and the plane needs to survive this), looking at system solutions over individual fault (redesigning a warning indicator so pilots cannot miss it rather than blaming individual pilots that do miss it), and a regulatory body of investigators that enforce standards and investigate failures with the aim of learning from them and improving practices. You are thinking about the specific resulting design choices rather than the system that led to them.