I recommend reading about "blameless postmortems" [1]. Our natural tendency is to look for who is responsible for an incident and point the finger of blame. Over time this leads to a cover-your-ass culture, whether you like it or not. Therefore such a tendency needs to be actively fought against to keep the focus on quality engineering and not politics.

"An atmosphere of blame risks creating a culture in which incidents and issues are swept under the rug, leading to greater risk for the organization."

[1] https://sre.google/sre-book/postmortem-culture/