Exactly. Every system will experience failure; it's how the system responds to the failure that is so important.
You can only reject the robustness principle ("Be conservative in what you send; be liberal in what you accept."http://en.wikipedia.org/wiki/Robustness_principle) if you can completely control the input 100% of the time.
You can only reject the robustness principle ("Be conservative in what you send; be liberal in what you accept." http://en.wikipedia.org/wiki/Robustness_principle) if you can completely control the input 100% of the time.