Disabled doesn't mean "incapable." A person with disabilities can and should have a shot at meaningful, well-paid employment--same as anyone. And the right to that shot is legally protected.
Here's an excellent article discussing how those with disabilities can present themselves as solid candidates for a job--and some additional references and resources (three of each--you have to click to find the list). http://work.chron.com/job-interview-tips-people-disabilities-6998.html