Because people spend a large portion of their lives at work. I think it’s sad that so many people have to work these kinds of jobs because their talents aren’t monetisable. A person shouldn’t have to justify their need for shelter or food.
while a good moral argument, the world has not reached a point where such outcomes can be had. At some point in the future, when there's post-scarcity for all basic resources, then it would be possible that people shouldn't have to justify their own shelter or food.