It does happen - it happens all the time. Go to any reasonably sized college campus and FOIA their police and medical records and you'll find many instances of

It does happen - it happens all the time. Go to any reasonably sized college campus and FOIA their police and medical records and you'll find many instances of bystanders being injured by baseballs and frisbees every semester. However, students are by and large willing to put up with this side effect in order for the commons to still be a place to recreate. Precautions - for all sorts of flying things - is reasonable. And failing to take them is negligent and rightly bestows liability. But drones introduce nothing new in this respect.