Users are a terrible thing. Systems would be infinitely more stable without them. The human users of a system have this knack for creative destruction. When your system is teetering on the brink of disaster like a car on a cliff in a movie, some user will be the seagull landing on the hood. Down she goes! Human users have a gift for doing exactly the worst possible thing at the worst possible time.
Users are a terrible thing.
Worse yet, other systems that call ours march remorselessly forward like an army of Terminators, utterly unsympathetic about how close we are to crashing.
Every user consumes some system resources. ...