Yes, people should not be flying these things around airports, but national parks? A couple of years ago two elderly hikers got lost at the Craters of the Moon National Monument in Idaho. They died, and their bodies were not found until several days later. The family wanted to use a drone to help locate the two individuals (I believe it was a military drone from an Air Force base), but the park service would not let them. It is hard to say for certain, but maybe, just maybe, those two people would be alive today if a drone had been used to search for them.
If I need a piece of gear, I try to make it myself. If I can't make, maybe I don't need it.
I think this a better link...
Great concepts are always, always ruined when government gets involved.