Yes because clearly the only place in the world to get catnip is at a pet store, and the only cats in the world live indoors with people. 8) Catnip grows wild all throughout the northern US, from Maine clear across to Washington state. Both feral and outdoor domesticated cats seek out wild catnip to chew on, and they do this on their own volition.
Someone beat you to it on that correction,
This catnip crap is a completely different issue, anyways. It's a straw-man fallacy, and it's also just plain ridiculous. If you give your cat LSD, you'll probably kill or seriously injure your cat. It's completely immoral and wrong; LSD is not as safe as all the spun out hippies say it is, especially not for small mammals.
I was not arguing LSD being safe, I was arguing that giving psychoactive substances to animals is not inherently wrong, immoral or abusive. That was not a strawman argument. If you want to specify specific drugs, I'd definitely say LSD is not safe to give to any animal for non-scientific (and properly done by someone trained to do so) experiments.
Don't give your animal drugs unless they're prescribed by a licensed veterinarian. If your cat wants to chew on a potted or wild catnip plant, let it do so. That isn't harmful to their health, and its a natural part of life for a cat.
Are you saying that only catnip self-administered is moral? I don't agree with that if you are saying that.
Are you saying someone shouldn't give an animal benadryl for allergies, since it isn't prescribed by a licensed veterinarian? Vets recommend it, and it was given to my Chihuahua for her grass allergies (poor thing... as tall as the grass she was allergic too...)
Don't give overzealous absolutist advice, that's just as wrong as advocating something harmful to animals.
The safety in giving any drug to an animal is entirely based on what substance and at what dosage. Some are definitely not safe (most recreational drugs). Some definitely are within reasonable doses and used for intended or naturally occurring reasons (primarily herbal/OTC medicinal such as Catnip, Benadryl, etc)
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For anyone who wants to see alleged effects of LSD on a cat:
http://www.youtube.com/watch?v=EJEw3A_QO9o
Assuming that is an accurately described video of an actual experiment, it's brutally obvious how wrong it is.