Who's right, who's wrong?
"Child, do you wish to kill them all?" The fairy-like being asked.
Lith nodded. Wasn't it obvious?
The lady then said with the gentlest tone one could that Lith should rethink what he should be doing.
She then showed him various things.
The organization that made the slaves do these things was, in turn, just another slave organization under the control of a higher power.
These people were made to make the slaves under them work forcefully.
They had children, wives, and families that they needed to feed. They were powerless to resist the higher organizations and thus made other slaves work.
The higher organization was the government of the country itself. They were trying to find the secrets of a renowned demonic cultivator. They told the people it was archaeological research and used much of the taxpayer's money.