I, for one, actually feel a great deal safer and more comfortable because of the existence of the ham community. Their history is impressive, their public service is undeniable, and they do a better job of maintaining communications in the face of massive disasters than the government, the telephone (including cell) service, and the internet.
I don't know about this sort of thing in particular, but I personally know 8 people in Canada & Europe who used to regularly come to the US but no longer do so because of the sheer awfulness of the TSA.
I imagine the overall number must be pretty large.
Yes, the capabilities of semi-autonomous vehicles are remarkable. I wasn't going into that because it just makes a complicated topic even more complicated, but when you factor in things like birds being able to automatically perform autorotations (so they don't just fall out of the sky even in the event of total engine failure), those kinds of birds can be actually safe for reasonable values of "safe". Certainly safer than delivery cars.
"a drone needs decent weight and power, nut just to be able to carry a load, but also to be able to fly in anything other than dead calm."
Not weight (it needs as little of that as possible), but yes, it needs power. But of a different sort.
"Also if the drone is to fly in a built up area, it had better be maneuverable, so it can deal with disturbed air around buildings."
Also true, but it doesn't need the extreme maneuverability of sport copters. It doesn't need to be able to perform acrobatics, to fly upside down, to fly tail down, to do loops or barrel rolls, etc.
"To be useful as a delivery vehicle, a drone is also going to be dangerous if things go wrong"
I never said otherwise. What I said was such a vehicle can be made much less dangerous than a sport bird. This is clearly true. For example, if you have two birds of similar weight and engine power, but one is a quadracopter and the other isn't, the quadracopter is much less dangerous. The rotor speed is lower (so less kinetic energy per blade), the top speed is lower (so less kinetic energy in power dives), and the drag is larger (so less kinetic energy in free-fall).