I hope that for those whom hospital induced paralysis is an issue use some assertiveness in dealing with such patients.
I'm sure the ones that complain, because you say to them "You are capable of wiping your own bottom, now I have to go and do XXXX. Let me know if you need anything that you can't do yourself" and treat them well accordingly without pandering, are few and far between.
I've had elderly gentlemen ask me to wash their genital area for them when they can do it themselves, and my response is "I'll do your back and your feet, you can do all the inbetween bits" and they do understand you are just calling them on their BS.
Don't stand for it, and you won't have to keep doing it.