I'd prefer the distant buzz of a drone to the argumentative bickering & bawls of brats. 
If a drone falls in the toxic waters of a Yellowstone geyser, it will have no discernible effect. Certainly less than the untold millions of foreign objects that have been tossed in the same geysers over hundreds of years. What effect did the man who recently fell in & dissolved have on the hot spring?
Millions of acres of public land with some of the best scenery available have been arbitrarily declared off-limits to drones. These devices can capture views impossible from the ground & there is certainly a way of allowing them to co-exist with pedestrian traffic.

If a drone falls in the toxic waters of a Yellowstone geyser, it will have no discernible effect. Certainly less than the untold millions of foreign objects that have been tossed in the same geysers over hundreds of years. What effect did the man who recently fell in & dissolved have on the hot spring?

Millions of acres of public land with some of the best scenery available have been arbitrarily declared off-limits to drones. These devices can capture views impossible from the ground & there is certainly a way of allowing them to co-exist with pedestrian traffic.

It's not.. as they are not the same thing. When you are standing on a trail looking out over a beautiful landscape or viewing something like Mount Rushmore, will your experience be the same with a drone buzzing right over your head? How about flying a drone over a geyser at Yellowstone and it falls into it? These things are the same as people walking on a trail?
The ability for children to enjoy our Nation seems a little more important then someone using a drone to get a photo. I've been to a lot of National Parks. I think I'd much rather put up with 10 or 20 kids rather then 10 or 20 drones buzzing all over the place.
It's a trade off... millions of people vs preserving the National Parks. The parks system does a very good job at managing this. So much so that these people cause very little harm to the attraction. Certainly _far_ less then if it was not managed.
There is a time and place for everything.