I'd put it a different way. It is the job of a program to be free from faults, as much as possible. It is the job of a firewall to protect programs from being

I'd put it a different way. It is the job of a program to be free from faults, as much as possible. It is the job of a firewall to protect programs from being exploited, as much as possible, when there are faults. It is the job of legislators to write laws that are as free from faults as possible. It is the job of judges to protect the people from unavoidable faults in legislation.