Yes that is okay, to help a disabled person walk again. It is okay that the community pays for his medical treatment because we all profit to have a functional member in our community again.
The difference with the "fatties" is that you send them on a treatment for 3 weeks, they do lose 10 kilogram (20 pounds in old currency) and after they get back from their expensive treatment is takes about 3 weeks for them to add those 10 kilos again. (I always marvel how well they can manage their bodyweight, upwards).
Now take the guy who learned to walk again, what are the chances that he will cripple his own legs again with a big metal bar as soon as the doctors are not looking? I would say practically zero, same as the amount of fatties with a thyroid condition. So I have a problem with fatties who choose this life style and expect at the same time that the surrounding community is supporting him/her with that. Think of medical care, special infrastructure, early disabled because of secondary complications, etc.
Just because food is not classified as a drug it doesn't mean you can't say it isn't an addiction. Should we expect the same protections for crack addicts (who chose that life style) when they apply for a job in a kindergarten?