It's a matter of probabilities, not certainty. And workers quite often DO prefer to trade off safety against other concerns. Not just pay, either. Convenience is a big one. When I worked at a factory in China, I was told the people using heavy machinery had safety goggles available but often preferred not to wear their googles, because doing so was hot and uncomfortable. Management would nag people to do so but wouldn't require it. In that sort of circumstance, giving workers objectively more freedom and personal responsibility allows them to be less safe - but more comfortable! - compared to how they would be in the US with OSHA breathing down people's necks.