You are absolutely right. But/and I feel bad for the cat. It's not her fault.

And I admit to being a little cross with the LW for wanting to take the cat back to the shelter because the cat and her husband get along so well. Will depriving an animal of a happy home and the husband of his pet actually improve the LW's relationship with her husband? I hope she means she "wants to" in the sense of "I know it would be a bad idea to do this but it's my emotional response" rather than "this is the plan I've come up with."