For
Cats kill millions of birds and small animals yearly.
Against
It restricts natural behavior and animal freedom.
Anonymous excerpts, translated where noted.
“I'm in favor of keeping cats inside or supervising them outside.”
“Cats regularly kill birds and other wild animals, and there are few left anyway due to advancing civilization.”
“I generally believe that cats should be allowed to go outside if possible, but they should definitely be neutered.”
“I see no reason why you should keep a cat indoors when there is the possibility of going outside”