There you go again. Like so many protectionists, you only see one side of the equation. If you admit that American investment is good for a foreign business, then foreign investment is good for American business.
Do you not see the flaw in that statement?
The pivotal question is why? We can do all this in this country just fine, and have, and become a great nation doing it that way. Why mess with what works?
The only reason I'm able to glean is that trading spit with other nations to such a degree will make them dependent on the American consumer for their riches, so that they wouldn't dare attack us. This shows an abysmal ignorance of human nature, especially that of despotic regimes.