No one needs a firearm in a National Park. There is not and should not be any hunting there. No one needs to protect themselves from bears in protected areas because people shouldn't go there and bother the protected animals, and if they do they do so with extreme caution and accept the risks. Asking for trouble is foolish, and, as usual, armed people only act more cocky because they have the weapon.
They should have put an amendment between the first and second specifying that common sense, civility and restraint was the standard of thinking at the time of the amendments.
Now, let the extremists swoop down on this totally reasonable comment.