What do you mean by this comment? I don't think many people, even the Marxists, are arguing that capitalism isn't a good thing; the disagreement is whether the capitalist mode of production is the "best" way to organise production.
Is that also your answer to S. Korea, Singapore, Japan, China's mind boggling explosion into prosperity, Chile, the western parts of Europe nearly completely destroyed by war, etc etc ad nauseam for every country that embraces free trade? No shocker that the poorest continent is also the one with the least amount of free trade policies - Africa.
China's explosive growth in standard of living, bringing a billion people out of extreme poverty just 20 years after changing their economy to one based on free markets - American Imperialism?