I volunteer on projects with people who have severe back (and other) issues. But when anyone uses a false generality to gloss over people's real issues, he becomes a pandering doufus.
Do people abuse the system? Yes to all systems. Look at the games the wealthy and corporations play to abuse systems. Now if he wanted to start with the largest abusers of the public trust and pocketbook, the bribery system that is in place where people and company in effect buy politicians, I'd be with him.
And if he had specific suggestions about how to have a better constructed system for disability, fine, I'll listen.
But to ignore the powerful and well connected elephants producing tons of dung in the room to attack the weak and powerless, then he's a menace to society or worse.
And when he asserts utter self-interest, selfish-interests, over everything else, he becomes at best immoral in my book.
I get an impression (perhaps mistaken) of justifying abuse of the system by people feigning disability is justified by corporate welfare. You should know that Rand Paul opposes the latter.