Earlier quoted context omitted.
I don't understand your reply. No one is good enough to write code without bugs.
> No one is good enough to write code without bugs. This is congruent to saying, "Whitelists don't exist. Everyone implements poorly scoped black-lists."
People make mistakes. Systems should be designed for this expectation. If mistakes are extremely costly it implies you should use certain tools and development methodologies, if not you can use others.