The way your method works is only if the opposite is true. There were no safer jobs available because there were no regulations for safer jobs and if anyone bitched, they could be thrown out and you take the next guy in line. Same if someone got hurt. There is no incentive to create safe work conditions when the labor pool is so large compared to the number of available jobs. In fact, there is incentive NOT to do it. Because making something safer is inherently going to cost more money up front. In a strictly capitalist sense, a company wouldn't take that short term loss to make a safer work conditions when they could be making more money and facing no repercussions for doing so. Which is why we then use government force against the companies to install some amount of work safety measurements.