Take for example how the FBI wants to have automatic access to the data in all iphones through a backdoor. Would that be considered OK if they asked lockers makers to make their locks accept a master key so they would be able to enter in anybody's house, so they could monitor further people they suspect to be terrorist?
Of course that would cause an uproar, but the general public being so uneducated with technology, I guess they don't see how the two are related.