You're assuming that factory workers are stupid and incapable of judging living conditions on their own. The fact is that millions of people voluntarily moved thousands of miles away from their families and hometowns to a country where they can't even speak the language, just so that they can work in a factory. That is not a decision that they make lightly. The fact that they had to work for long hours and shitty conditions is evidence not evidence that they made poor decisions, but that their supposedly idyllic country life was that much worse.