The intention of this disgusting practice show how base human nature can be. Originally intended to be a review of an outage or network impact so that analysis of the problem could occur and management could consider action that might prevent a repeat of the problem. Thus it was “brainstorming” the problem
The reality is that most people are not big enough to own up to an error, or admit that they did not follow procedure, or that some part of the design did not work as expected. The person in charge is forced to conduct a witch hunt, and ends up running a judicial process and less like an arbitration.
Someone is going to be blamed. And the process becomes a negative thing.
And that’s why its called “blamestorming”.