We solved that by making ATMs unmanageably heavy. Not the best option for a drone.
Yeah maybe it's not the same solution. But it's a solvable problem, I believe. I trust that the Amazon team had this conversation 2 years ago, and came to some conclusion that the risk was manageable. Would they send their lawyer to congress fighting FAA regulations if an 8-year-old kid with a pellet gun could knock one out of the sky?
The Amazon drone won't take off unless you confirm in advance (using the app) being able to accept the package, and you need to enter a code at arrival for it to release it to you. I am sure the drone can call for help, and keep lots of video and other evidence of what happened to it.
Ultimately, Amazon just calculates the loss of 1/10000 drone packages into their profit calculations.