In many jurisdictions, GP would be within their rights to shoot at them in that case.

Re the FAA rules, there's a clear difference between planes or helicopters going overhead at safe and relatively high altitudes* and drones flying at much lower ones. Occasional passes from hobby or semi-pro drones used by photographers are a minor irritation, but if drone delivery became a regular thing I can see how frequent low altitude flybys would quickly become maddening. relying on existing law for new circumstances generally yields poor results.

* I live quite near a hospital with a helipad so about once a month I have to deal with a helicopter coming under 100 feet (~35m) and making the walls shake.