[TerraHertz]

There's a fatal flaw.

Even if commercial delivery drones could be engineered to not crash into people or houses, not tangle with power lines, not cause accidents on highways, and not collide with each other once they are common, there's one thing that will instantly get them banned.

That will be the time someone uses a UAV to deliver 10 Oz of Semtex and a proximity sensor to someone they don't like. Exactly how are you going to stop that becoming common, if there are lots of UAVs in the air everywhere?

Actually this factor is probably why they will definitely be banned before there is any commercial take-up. Because there are some powerful people who very many people don't much like. And this application will be very unpopular with the powerful.

[gluczywo]

You can use a car packed with explosives triggered by mobile phone to target someone you don't like. It's much easier and more reliable than the short-distance drone. Should we ban cars and mobile phones?

[rlpb]

Let's say that I'm one of these people. It's already illegal for me to send a UAV to your house with Semtex and a proximity sensor, since trying to kill you is already illegal. What makes you think that a ban on UAVs will stop me? How will a ban on UAVs help you protect yourself from my illegal murder attempt?

[paul_f]

Replace the word "drone" or "UAV" with "truck" and re-read your comment.