For
It protects nature and prevents overcrowding.
Against
It restricts access to people who may travel far to see them.
Anonymous excerpts, translated where noted.
“there does need to be a cutoff.”
“If 100 people can walk a trail per day without causing irreversible natural harm”
“it doesn't feel quite right to me to limit access to national parks.”
“This would effectively bar low income people from visiting”