There's a big difference in my mind though, between feral pigs and feral cats. Not only are feral pigs destructive to other animals, they are destructive to the entire ecosystem. Also, you can EAT pigs. You ever eaten a cat? And I aint talkin about the last time you went down on your girlfriend/wife either. Even people who DO include cats in their diet from time to time dont prefer it. I can name quite a few folks I know who prefer pork to just about anything else.
To me, if you want to hunt something, it should be hunted for food. Even if it's part of a "herd culling" effort, it should still be a game animal. Cats are NOT game animals, no matter how you want to write it up. Also, the law they wanted to pass in Wisconsin basically let you kill them any way you want to without any fear of prosecution, even if it was a domesticated animal without a collar. If it showed any fear of humans, it was considered a target for the purposes of that bill. Hell, my cat hides under the bed when anyone but myself or my wife is in the room. Alot of cats are wary of strange humans. And they should be. And cats are geniuses at figuring out how to slip a collar.