There's a moral argument to be made that people deserve jobs because society forces you to work. If you don't work, and you're not independently wealthy, you can't support yourself. Therefore to say people don't deserve jobs is to say they deserve to be out on the street.
Great answer. And even if you don't buy into the morality bit, those in charge figured out long ago that giving the little people a job, regardless of how pointless or wasteful, is better and cheaper than having to constantly deal with hungry, angry men on the verge of revolt.
And if the plebs get too demanding, the owners just push up the price of basic goods like housing, taxes, and food via inflation. So now you think you're doing great, making six figures, but in reality you're worse off than the previous generation while producing twice as much profit for your masters. But at least you're not causing trouble.