I'm thinking of stealing a deaf outdoor tabby cat.
Why would you steal someone's cat?
I have not hatred towards the owners, but I want to protect the cat.
While it's good to be concerned about the welfare of animals, stealing a pet from someone is extremely wrong. The owners probably love that cat and would be crushed if it went missing. You should get a pet of your own instead if you want an animal to take care of.
I want the cat so I'm going to get it.
Don't you see how you're hurting the owners though? You shouldn't just take something that isn't yours.