The first and continuing argument for the curtailment of working hours and the raising of the minimum age was that education was necessary in a democracy and working children could not attend school.
'3:10 to Yuma' was one that I just kept on talking and thinking about after reading it. And I think the reason is because, like in most Westerns, you have the very clear-cut bad-guy/good-guy, however, as the movie progresses, you kind of see that it's a very fine line that divides these two.
If you assume that it was a valid experiment, then its disintegration reveals a very substantial part of what has been found since then, including the fact that you can get heat generation at high temperature.