Parks are full of cars, motorcycles, ATVs, people walking around, talking, shooting selfies. All these things we don't notice because they have been around forever and we put up with them. Now a drone, no matter how quiet, seems to be a nuisance. And people complain even if they see one off in the distance. I get not having lots of drones in popular and crowed places like Old Faithful in YNP. But otherwise I think many of the rules are overkill.