That's not really true; as evidence, I give you Room 641A:
https://en.wikipedia.org/wiki/Room_641A"Room 641A is a telecommunication interception facility operated by AT&T for the U.S. National Security Agency"
As long as you have a backdoor, and Apple does, shady government agencies can and do come knocking. We've got plenty of shady government agencies, and can never guarantee that we won't have more in the future.