Imagine if your manager copied the safe bridge you designed with a magic replicator and now uses that exact same design somewhere else. You tell him that the bridge was not designed for this location and that the bridge will collapse in 5 years. Your boss fires you but you are still responsible for the collapse of the bridge.

Let's go further into absurdity. The engineer is kidnapping the daughter of the manager and blackmailing the manager to take the bridge down. Is it ethical to force someone else to be ethical even if its only possible through unethical means? What if there is a hero saves the daughter? Will the hero be liable for the collapsed bridge?