Did you know that one of the biggest issues that bother cat owners is the fact that cat's scratch and their scratching can be destructive? If you are "owned by a cat" (aren't we all! - they own us don't they!) or are planning to get one remember that scratching is a natural instinct. For a cat to not scratch would be abnormal behavior and something you should actual seek medical attention.
Perhaps if you understand the reasons why cats scratch you will recognize how to change the cat's environment so they will have the appropriate scratching tools and limit or prevent destruction of your furniture and expensive items in your home.