The animals sure wouldn't be just as happy without that valuable enrichment.
What's the problem with non-toxic paints? They are non-toxic after all - if the individual animal doesn't mind, what's the issue? Same question for walks.
How is taking a porcupine for a walk different from taking a dog for a walk? I hope you aren't claiming that people who walk their dogs are commiting animal abuse.
So how are they quantifying the benefits of this enrichment? And in answering, please let's try stay away from the anthropomorphism.
I think what irks me is that these animals are being treated as pets. But we need to remember that they're not pets, but wild animals.