|Unreasonable working conditions are largely a mater of context and perspective. |
Long hours, low pay, and relatively low safety that might seem a totally unreasonable combination for the typical average American could be a dream job for the majority of the people who have ever lived.
The fact that it might be a buyers market for labor in certain situations isn't an infringement on workers liberty. The fact that conditions might be rough and pay poor, is even further from an infringement on liberty.