It makes no sense at all. After the outage you have not only a review of the causes and appropriate remedies, but also more experienced people who are now more

It makes no sense at all. After the outage you have not only a review of the causes and appropriate remedies, but also more experienced people who are now more aware of possible consequences of seemingly unrelated actions and will take extra care not to make these things happen in the future. Also, such cases are rarely the "fault" of a single person. Or, the direct/immediate cause is often not the main one.