They shouldn't. If FB has a proper PMA culture in place, you figure out why the processes in place didn't work that allowed this kind of change to happen, so more testing, etc. Should be a blameless exercise.
Not if FB has a halfway decent engineering culture. People make mistakes. They're practically fundamental to being a person. You can minimize mistakes, but any system that requires perfect human performance will fail.
They shouldn't. If FB has a proper PMA culture in place, you figure out why the processes in place didn't work that allowed this kind of change to happen, so more testing, etc. Should be a blameless exercise.
Not if FB has a halfway decent engineering culture. People make mistakes. They're practically fundamental to being a person. You can minimize mistakes, but any system that requires perfect human performance will fail.