Just to play devil's advocate a bit, and kind of explain some possible reasons for declawing...
We had our first cat declawed, didn't know any better at the time. She suffered some nerve damage (or something) in one of her paws after it was done and as a result always had one very sensitive foot. I think that the sensitivity in her paw caused her to be less active and eventually she got very fat.
Our second cat we opted not to have declawed after what happend to Frisco (first cat). No matter what we tried, we could NOT get her to not scratch on furniture. It caused many fights over the years in regards to furniture and didn't allow us to get new furniture for some time simply because we knew she would destroy it. We actually even considered having her declawed when she was older, but didn't.
When my old roommate moved in and wanted a cat I agreed. I felt that because I have two dogs and she didn't have any pets I couldn't very well say no, you can't have one, but I can have as many as I want. I did tell her that if she was going to get a cat that it had to be speutered AND declawed because everything in the apartment is/was mine and I knew that she wouldn't take the time to train the cat not to scratch at/claw the furniture. Guess what, I was right, and although I have no more of her as a roommate I do have lots of pulled up threads in the carpet and the bottom of the couch is destroyed. She did have him neutered and declawed once he was old enough. Some will say that I could have taken the time to train him not to scratch on the carpet or couch myself, but in all honesty he was not my cat and not my responsibility. I also had enough on my plate in terms of training my own dogs and working.
We now have Stan, he has his claws however he rarely even tries to scratch at something so there isn't much worry right now and with his prognosis and our lack of new couch I'm not worried about teaching him to not scratch on something and am more focused on keeping him comfortable.