[oldmanhorton]

I don't think it would demand that the software be infallible. If a "new type of earthquake" happens, the Civil engineers won't be responsible for their bridges failing. In the same way, if there is reasonable effort made to ensure the system is secure by standards of the time, I don't think these theoretical individuals would be blamed for particularly novel (zero day) or unpreventable (social engineering, to at least some extent) attacks.