I could do the same for Koreans, justifiably or just as unfairly. You are not perfect, nor were the more democratic post WWII people you seem to champion. Certainly not from your own reporting. In the Vietnam conflict alone, we spent twice the amount of foreign investment outside of the country, and much of that was soon nationalized at cut rate compensation level just afterwards. The US strategy is to secure markets by military means for its expanding capitalism.
History is full of twisted conveniences like the evil European powers squeezing their colonies dry.
Studies have been done, proper ones, which show the rate of return was slow and many if not most colonies did not even show a net profit all things considered. And other fallacies ad nausea abound. The problem is that decent people believe them and cause all sorts of trouble when inevitably seized by unscrupulous opportunists as a useful political mouth-frothing tool. So I do not trust this type of tone at all, in extreme. In short, the world gains much more than the U.S. does with an increasing pie.