It has to come down to deliver. Even if doing roof deliveries, if they are on a roof within a building or two, they won't be that far away from the drone.

Plenty of young people put good skills to use in stupid ways until they get older (and some never hit "until"). Sometimes it's how they develop those skills in the first place.

The big reason why I think this is likely is the same as why I think it's more likely with autonomous car package delivery. An employee is a wildcard in the equation, they may care above all reason about the crime, and that can be the difference between easy money and going to jail.

What about using a drone to take down another drone? Also, a drone need not be taken down by physically attacking it. Its command and control system could conceivably be hacked.