I agree with the first answer. But I would add one thing.
The first answer says we have to remember that those days were not like today and so we must not hold them to our values. But we also have to compare those days to what came before.
It is true that kids had always been expected to work. But before the Industrial Revolution, that work had always happened at home, within the context of the family's work (farming, mostly, but other things too).
Once industrialization came, the kids were expected to work, but now they were working away from their family and under the supervision of strangers.
This put stress on the families because it was a very different social situation than had existed before.