The Chinese are buying these US companies because the investment engine in the US is broken. Few people in the West want to invest for a reasonable return anymore - they all want above average returns and get-rich-quick ponzi schemes of which the Banksters can provide many and are usually the first (i.e. most rewarded) subscribers.
The end result is that the West will eventually own little wealth-making enterprises and have no money to buy the goods that are produced. We will become the low-wage slaves of the new mercantilist eastern empire