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CursedLight The point is here. They blame the mandrake factory because they think that the job is cruel (Which would be if they had hearing). But since they are deaf, the jobs is pretty easy for them. People use their ignorance, their narrow view and establish that the working conditions are bad, without anything to base this reasoning. They also don't do that to help, just to satisfy their own ego.
It's exactly like the sheep:
Removing fur from animal is bad = working with mandrake is bad
Since removing fur is bad, searing sheep is bad = since working with mandrake is bad, deaf people doing it is bad
Sheep are left to die because of their too dense wool = deaf people have an hard time to find work because the factory closed.
And in both case, people don't seek to help with the aftermath. They did their justice, satisfied their guilt/hypocrisy/ego and that suffice for them. Really helping requires too much work.
The last point can also be seen in some of the animal release, from butchery/zoo/labs/.... The animals are just released in the wilds, dying rapidly because they have no instincts. These groups only release the animals to feels good about themselves, not to help the animals. If they really cared, they would take them and try to restore their instincts like in the more serious groups.