I don't believe that several hundred thousand people migrate out of the US every year. Such would certainly make the news. Yes, there are ex pats, but not many.

What would you say the number of people dying in factory fires were?

Since life expectancy went steadily up during the 19th century, it doesn't seem like factory fires had a worse effect than the positive effect of better nutrition, sanitation, housing, etc.

> I’m not going to bother responding to these paragraphs

Those numbers are easily findable via google. If they don't fit the thesis that Amazon is a hellhole for workers and bad for customers, oh well. The migrants that come here by the hundreds of thousands also are not turning around and running away once they discover how awful it is here.