Only wrong in your view....I'm interested in how she/he is able to enter his property, no doubt on several occasions over an extended period of time, and physically/purposefully teach the cat(s) to dig/crap in his garden. The other question is why would they do this when they, I presume, would have their own area on their own property for their cats e.g. garden or litter tray?
Now that I think about it, where do my cats go to poo? Certainly not in my garden, not that I have seen, and I certainly don't teach them to go elsewhere?