Perhaps, but at this point that means pulling the rope ladder up behind you so no one else can use it.

No.

There is no perfect system. That doesn't mean you don't implement systems. You just police them better to make sure that kind of problem doesn't happen any more.

Hard to find problems with a system that doesn't exist, so perhaps some "systems" are perfect.

Systems, like functional code, can seem perfect in isolation. Everything is accounted for and it's provable. Beautiful!

Applied to any useful purpose, though, there are externalities and there is the unexpected. If you include those externalities in your model, you not only have a more complicated model, but you probably have an even larger surface of externalities.