Because as safetypee points out it is difficult to assess safety from outcomes. Systems and procedures are where one should look for safety because safety is occurring all the time! More often that not things happen safely. But when things go wrong it can be a sign of systemic problems - larger issues within an organisation as a whole with regards to attitudes and attitudes to procedures and design of procedures. For example; doing things a certain way because they’ve always been done that way without regard for hard data.
I don’t think noting three separate incidents that are all of public record and all had procedural errors all under a large, linked system is ‘mud-slinging’ but I do think calling ‘mud-slinging’ is taking it personally and introducing emotion into a pretty emotionless conversation.