A plongeur is a slave, and a wasted slave, doing stupid and largely unnecessary work. He is kept at work, ultimately, because of a vague feeling that he would be dangerous if he had leisure. And educated people, who should be on his side, acquiesce in the process, because they know nothing about him and consequently are afraid of him.
There is something deeply hypocritical in a society that holds an inner-city child only eight years old "accountable" for her performance on a high-stakes standardized exam but does not hold the high officials of our government accountable for robbing her of what they gave their own kids six or seven years before.
Books appear to be frail and disposable, but they are sacred. You can burn the paper, but the stories live on. In the same way, a poor man or woman is not a burden on society, they are those who survive despite the odds - and when they don’t, they still represent those who tried.