They're not mutually exclusive. A staffer leaving a backup system running may well have been the proximate cause of the issue but, if true, it was also likely a

They're not mutually exclusive. A staffer leaving a backup system running may well have been the proximate cause of the issue but, if true, it was also likely a management/system issue as you say. The article is a bit strange in that it doesn't attribute the fact in the headline to any source. I don't see anything from the NYSE saying "it's all that guy's fault". On the contrary it says: > [NYSE execs] plan to examine the platform’s procedures and management, potentially reworking rules to be more flexible and provide further protections. Sounds like they know it's a management issue. The headline probably focuses on the staffer leaving the backup system running simply because it's a better headline.