The only person I've ever heard of being fired for an operational error was a principal networking engineer at Amazon who end-ran DNS policies and hand-edited a zone file. Somehow, the file got truncated. It brought down everything including the soft phones so people couldn't even spin up a phone-based conference call to deal with it. I think Amazon was down for several hours, with 8 digit losses. That was in the mid 2000's. Heard that person was fired but don't know for sure.