Not everyone has what it takes to point a gun at a driver's head (actually, not everyone has a gun in the first place). If the truck is driverless, then it removes the courage factor, the inherent risk of having to deal with a human, and now it only takes cunning and intelligence. Since it is driverless, you could even use a RPG rocket against it, without risking a human life. Maybe, I played too much GTA. That being said, I find it hard to predict whether crime or security will prevail.