Why do you believe that the regulations for the onsite manufacturing of chlorine or ethylene are going to be any better?

The issue is that the companies have been playing fast and loose with safety. If you don't choose to reverse that, it doesn't matter whether you transport the chemical or manufacture it on site.

During travel the other day, I saw a molten sulfur train car.

And what about the 100's of billions in fallout regarding this massive shift in US manufacturing?

Oh no, some billionaires will need smaller yachts.

More like billionaires will short that stock and get bigger yachts, while huge swaths of this country see job loss with no replacement or much of a social safety net.