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> Are the others, in fact, just as bad?

Well, just one example that came to my mind from a documentary I watched recently:

http://www.aljazeera.com/programmes/viewfinder/asia/2013/07/...

It's nearly impossible to link a single case of cancer to a particular cause, since the whole process is deeply probabilistic. Absent evidence of routine abuses at this factory and a significant increase in cancer incidence among workers, it doesn't really work.

A knee injury, on the other hand, is trivial to link to the on-the-job accident that caused it in many cases.

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