The trouble with your analogy is that physical reality works the same way. People have been committing mail fraud since the advent of post offices. Spies have been planting bugs on delivered goods since the invention of bugs. The thing that causes this isn't digital devices, it's long-distance delivery of goods and messages.

Meanwhile installing software on your own device is the thing that isn't that. They're preventing it even when you're the owner of the device and have physical access to it. They're not installing a lock so that only you can get in, they're locking you out of your own building so they can install a toll booth on the door.