In are our nation's treasures in danger what is the author's point of view about the people who damage national parks

Gordon refers to these people as "souvenir hunters." A souvenir hunter is someone who takes a small piece of a national park (for example a rock or a leaf) as a memento. Since the souvenir is so small, these people may not realize the damage they are causing; however, since so many people visit these parks, all the tiny "souvenirs" add up to a lot of damage. 

Yes, just because one had a disability doesn't change the meaning of the word. they would most likely have an (whatever language) sign language to sign what's going on. it would be the same even if he was blind.