Because of over reliance on that industry and a tax base that bailed for the suburbs.
If you can't acknowledge the clear role of government in regulating markets as evidenced in the 13th Amendment, you're not going to have an open discussion acknowledging the role of government in making sure workers and consumers aren't exploited by free markets.
When I have said "we never try a single system, it has always been a hybridized approach" (four different times now in the thread), what do you think I mean by that?