If people are working at FoxConn voluntarily (i.e, they choose to go to work there because they believe their lives are better that way), who cares? If people are being forced to work there by the government, then U.S. and European governments need to decide if they're willing to allow trade with a government that uses slave labor. (I highly doubt people are being forced to work there, though.)
Now you are moving the goalposts from discussing Foxconn to the question of whether we should regulate free will.
I’m not asking you to agree with my stance on any of the following questions, but I do ask you to recognize that they are equivalent to your question, and to recognize that many other people hold differing views from your own:
* If people want jobs working at a construction site that doesn't follow safe practices like wearing a hard hat, who cares?
* If people want to work for $1 a day, who cares?
* If people want to work for an employer who insists on sexual favours as a condition of their employment, who cares?
I think you can recognize that while there are folks who don’t care about any of these questions anywhere in the world, including North America, in the US and in Canada there are a sufficient number of people who do care that we can readily say that our moral standard is such that we claim to care as a society.
As for being forced to work somewhere, I’d say you’re rarely forced to do anything, you just find yourself in an environment where the alternatives are so drastically unappealing that you effectively have no free will in the matter.
This is why we choose to impose safety standards in the workplace: We have discovered that the free market will act in such a way that safe workplaces are extremely rare, and in turn people seeking jobs will discover that they have few if any options available to themselves.