"Deserving disabled"? Did you really mean to write that forevergreek because it just sounds so thick narrow minded.
Some of the job suggestions on here are plain ridiculous. Where are these year round strawberry planting jobs that can pay £6+ per hour minimum wage? And voluntary work is unpaid that is the nature of it.
Also getting people into work is much more than can they use a computer or do a basic, unskilled, manual job. Other factors need to be considered including are there any jobs and is the person able to reliably fulfil an employment contract of X hours per week? Some chronic conditions like diabetes, epilepsy or arthritis can flare up causing people to take massive amounts of time off work. That is a huge issue for employers and employees.
Fwiw I think many, many employers could manage sickness and disability better but putting people into jobs they cannot reliably do can have severe consequences for the employer, employee and other employees.
One final point, just because you think you know someone disabled who isn't claiming benefit doesn't mean you are correct. They might just not have told YOU.