> A privilege, really? Who bestows that privilege?

You do

> I am certainly sympathetic to people who are genuinely disabled.

Agreed, and it can be uncomfortable to sort through what's genuine or not. One of my favorite scenes is in the big Lebowski where Walter confronts the other Lebowski claiming he's not a cripple and lifts him out of his wheelchair...Funny and sad all at once.

> That doesn’t mean we have to lie to ourselves that they are being productive by sitting around reading books.

Not asking for anyone to lie to themselves about what they feel is productive, rather giving another perspective to hopefully help people appreciate being able to work.