Genuine question, but does it change much compared to a wild bird ?
Yhey don't respect regulations nor space rules either, and I hope it's OK. If we lump drones in the same category shouldn't it be OK as well ?
http://en.wikipedia.org/wiki/Bird_strike
Relatively few fatalities for humans, but very high cost. And they are not made of metal or durable plastics. They are also less likely to fall onto your head with rapidly rotating blades due to technical failure.
Regulations do not necessarily mean that you can't fly any drone without a permit.
This wouldn't be an issue if we were only talking about upgraded small RC aircraft being used as drones, but some companies are selling much larger drones that are way outside of existing "bird strike" parameters.
You can't have dozens of unregulated news drones the size of a small car flying through the same airspace as rescue choppers.