Last I checked, humans do mistake all the time. Not related to systems, or anything really. It's all about being prepared for those and attempting to make as few as possible.
In order to avoid mistakes, you have to know they exist. So either they didn't know backups were important or they declined to prioritize and implement them in anticipation of their launch.
However, I sense you're taking issue with my "bad mistake worse" comment. I don't think anybody is going to argue that dropping a production database is a real mistake. Mistakes happen, and companies (i.e. management) should work to ensure that all the bases are covered, which weren't in this case.
