Really interesting video, although that music got on my nerves by the end.
As far as augie's comments go:
1. I somewhat doubt that they suffer from carpel tunnel. If you think about it they aren't picking that often, it's not a year round job. It's also not the same repetitive motion, it's not as uniform as say typing on a keyboard.
2-4. Personally I believe that the environment that they were working in seemed to be a quite safe environment. I think that they have a proper respect for the machine knowing it is a rather large and possibly dangerous piece of machinery. I personally am not that big of a fan of a forced environment where a worker could stop respecting the power of a large piece of industrial machinery. Granted i'm not in favor of very dangerous conditions ala industrial revolution, but i'm also not in favor of childproofing an industrial machine.