This is factually incorrect. First, the countries you mention included Germany and Japan, which, during World War 2 were both fascist states. Second, the USSR

This is factually incorrect. First, the countries you mention included Germany and Japan, which, during World War 2 were both fascist states. Second, the USSR in conjunction with Nazi Germany invaded Poland and together kicked off World War 2 - the USSR was a reluctant ally only to defeat a greater evil. Both regimes were outright evil. Third, colonial expansion was primarily done under monarchist governments. Fourth, if you want to (incorrectly) say that the US, UK, Germany, etc. and capitalist economic systems have the same feature of 'deaths of tens of millions of people" then you also would have to take into account that capitalist economies have also prevented the deaths of millions, provided the world with vaccines and breakthrough medical treatments, helped get us to the moon, and improved living standards for many billions of people. Communism did none of that over the long-term. Even Communist China has come around to support capitalism. Finally, the debate among anyone serious, and I do mean exactly that, isn't capitalism + free markets versus something else, but instead it's to what degree should a government be involved in the market. Capitalism is so obviously superior that it's difficult for anyone to bring about an improved economic system based on the human condition up to this point. Frankly, communism is a failed ideology at the nation-state level and it has been outcompeted by capitalist economies, which is why it doesn't exist except by violent force, and in those limited cases it is dwarfed in wealth, effectiveness, and benefit by all but the worst capitalist economies.