What are your views on disabled people being paid less?

If they are able to do the job efficiently, why should they be paid less? If there is a better person for the job, disabled or not, they should be the one hired. I would expect someone to be hired based on their ability, not their disability. It seems like discrimination to me because that is just saying someone can do the job the same but is worth less. If they aren't doing the job right, why are they getting paid at all? They should have the same chance at it as anyone else.