The newspaper boys who stopped Lynch only realized, after getting rid of the boss, that their suffering days would not change just because an oppressor and exploiter disappeared.
Many people always say that the pain in life is like a stone above their heads, and once the stone is moved away, life will get better. They even deliberately use an enchanting tone to tell everyone that those who exploit them are the ones who pay them wages so they can support their families.
Perhaps this is somewhat true, but not entirely.
The boss died, but the children's circumstances did not improve because the real oppression and exploitation came not from the boss, but from this profit-centered society.
It might even be harder for the kids after the boss's disappearance. Without the boss's social connections and intimidation of outsiders, the kids can't enjoy the resources that the boss used to bring in, resources that seemed to be the root of their pain but in reality provided for them.