Ya, globalization has changed my opinion on how we should handle these situations. How are US companies supposed to compete against other companies that are just as large if we restrict their size within the US? That just gives us a disadvantage against international competitors.

Because otherwise the companies that do win the global markets do the same thing to US companies that you are saying Amazon does to small companies.

How is it a good thing for the US to limit their own companies, when foreign companies don't have the same limitations? Giant companies will still exist, they will just cease to be US based companies.