I agree - sort of. A company should always present a unified front, and no one person should be asked to sacrifice himself (or herself) because of a problem.

Internally, however, you have to make sure you have processes in place to find out what happened so that if someone was responsible, you can figure out where they went wrong and teach them the procedures that will prevent the problem from happening again (this assumes that the person or people weren't willfully causing the problem, of course).