> In what country would it be deemed legal and normal for people to shoot down drones? Do people take pot-shots at light aircraft? Why would people suddenly want to shhot at drones?

I don't think it would be at all routine. But I can imagine trouble-making adolescents doing that (here in the US). Probably wouldn't be make-or-break for drones. But it would be an interesting challenge for Amazon -- how can we retrieve this equipment and how can we investigate its attack/distinguish from part failures?