China makes way, way too much steel. In 2015, it produced nearly 500 million tons more than it needed. Production of that steel was subsidized by the Chinese government in ways that violate international trade rules, so the price was artificially low. And China suppresses the value of its currency, further falsely reducing the cost of the steel.
The fair trade movement and concern about ethical sourcing asks consumers, all of us, to think more carefully about what we buy, and to ask hard questions about how producers behave. Air travelers who believe they are people of good will, people who embrace the Golden Rule, should ask the same question when booking a trip.