The other interesting question which has yet to be answered is whether laser damage to video sensors in an unmanned vehicle in the landowner's "airspace" is actionable.
The final interesting question is whether or not its actionable if your R/C plane that you were flying around on your land and it happened to run into a drone and both fell out of the sky is a problem for you or for them. (I'd start that one off by suing them to replace your airplane)
I don't doubt though that all of these will be tested in court though.
The reports of 'celebratory gunfire' deaths are all necessarily speculative - the angle of the shot is impossible to measure. We can resort to physics to get a better answer than that derived from headlines.
A close friend of mine was killed by a stray bullet this year at a 4th of July celebration. She was in a crowd of thousands of people gathered to watch some local fireworks. The shooter was miles away and probably has no idea that they murdered someone.
http://statenews.com/index.php/article/2012/07/student_shot_...