In China, there is no UAW, which costs auto-industry billions of dollars. There are no real minimum wages, ...
So you would be happy driving a car that is, to an extent, built using slave labour ? I suspect that the answer would be "yes" if it means that it costs you less — just as most people are happy wearing clothes similarly made using slave labour, but this time in Bangladesh & similar.
The thing - if a person is physically owned by another, not having freedom to leave, that's slavery. So right off, the emotional use of the words slave labor are misleading. It is not slave labor, it might not be at a pay level you would like, but
The whole situation is awkward to say the least. The unasked question is - what is your alternative to Chine's labor for Chinese citizens? Return to subsistence living? immediately raise wages to the highest of Western wages?
China is bootstrapping, just as Japan did. And it might not be at wages we in the west would consider acceptable, their standard of living is improving.
And what countries that bootstrap learn is that eventually, those who work end up demanding more money, competition within the manufacturing sector makes that happen, and in the end, the bootstrapping stops, leaving a country that is just another country, with no particular advantage in price of their products.
At which time, interest shifts to another third world country willing to bootstrap itself. And China will be one of the countries looking for cheap outside labor as well.
All this takes place over decades, and there can be mis-steps along the way. And eventually, most of the world will be at similar standards of living.