I have what is ostensibly an incurable terminal cancer and i work, by my own choice, 40+ per week. I see no issue with making folks in similar positions show that they are in fact, too sick to work.
If an individual IS too sick to work it should be relatively simple to get the required documents to prove that fact. God know i had enough hospital social workers and doctors asking me if it wanted said documentation.
That you are defending this while having terminal cancer is more depressing than not.
I really hope you have a great job which fullfills you and thats the reason why you continue working but A LOT of people do not have something like this.
It only shows how little our society values humans despite us having all resources and all knowledge necessary to feed and house every single human on the planet right now.
Wish you a fullfilled happy life.