a bomb hidden in a thrash bin or a stolen car parked on the public square. A bullet from sniper rifle from a mile away. No drones necessary. And just imagine what kind of, including chemical or nuclear, havoc can any engineer wreck with tech available today.
>Terrorism has always been a problem of technology.
centuries ago Church tried to outlaw crossbows:
http://militaryhistorynow.com/2012/05/23/the-crossbow-a-medi...
Safety through obscurity works only for very cutting edge technologies and only for the very short time.
Go ahead and tell me what we will actually do when these things appear.
You can poo-pooh security through obscurity but we're all relying on the "infeasibility" of defeating various systems. Just as one example, reputational attacks followed systematically without rest or hesitation can subvert entire communities and make them not trust each other. You only don't realize what dedicated technology can do to subvert human systems because you haven't had to face it yet.
If every time you launched your startup, an automated process would find, hack in and bring your network down or make a thousand sleeper accounts which will bring it down later, when you couldn't rely on them "just not finding you long enough for you to secure your network", then you'd have a different attitude.
Specifically for drones - having millions of them in the sky would naturally lead to 2 things - automated traffic control with ground and airborne AESA radar systems that even military would envy (after all an Aegis destroyer have to track only several hundreds objects simultaneously where is drone traffic control over Bay Area would have to track a million) and the second thing - "license plate transponders" similar to car. Any drone without registered transponder will be taken off the sky by a police drone similar like an unregistered car from highway today.
So, yes, somebody would use the drones for crimes like today they can use planes or cars. So what? The drone flight will be recorded in radar and various visual systems. And like in any other case investigation will trace the stuff back to perpetrators. And sometimes not successfully.
And yes, machine guns plus cars did produce the Dillinger gang and the like for some short time. And it resulted in FBI. The way of progress...
With drones, you won't be able to see any of that. The criminals who programmed the drones would be free from the law. And not only that, the "police drone" as you say might arrive too late, the drone might already have shot up some people. And then there's always the possibility that despite your best efforts, some drones are gonna fall from the sky on people.
Of course there are always black markets, but their scale depends on how much unmet demand there is that can't be satisfied by regular markets.
Previously, this was hardly a problem, because very few machines operated autonomously outside of a building. Cars had occupants. Helicopters and planes had occupants. Now, many won't. If a rogue drone with mounted guns starts shooting up a public square, we won't know who launched it unless the manufacturer played by the rules.
That's a serious problem for our society that's coming up. Terrorism has always been a problem of technology, and we're about to make more technology available to the masses, where some fraction of a percent of wackos is going to use it for nefarious purposes. The trouble with unmanned robots which are easily manufactured is that we can't trace who made it, sold it, or launched it. And therefore can't enforce the law on everybody.
I am more concerned about this than governments using the technology.