That thought right there is straight from the XIX century. There is no such thing as "freely willing", in the real world people provide labour in exchange for money in order to survive in a society that forces them to do it or perish.
> As far as "forcing" farmers to earn less, how are you going to achieve that?
http://www.theguardian.com/environment/2011/jul/02/british-f...
> Finally I highly doubt there is a good market for unsafe food products
Seriously?
http://ecowatch.com/2013/05/09/food-imports-from-china-under...
The food supply chain is much more opaque than you would think, even in Europe where regulation is much stricter than anywhere else. A lot of food producers will skimp on everything they can, short of killing tasters on their first sip.
> Are people too stupid to calculate probable risks and rewards
Not everyone has the education (or the inclination) to make such calculations, every minute of every day. This is why we have regulations in place: because predatory behaviour exists and can result in very bad outcomes, up to and including loss of life. I personally don't want to go back to "the XIX century plus iPhones".