Earlier quoted context omitted.
> The 2 major mistakes of mankind in the 20th century are fascism and communism. That's a bit misleading cause fascism is just inherently bad while communism has had some implementation problems.
I really disagree with you. We have had a couple of dozen communist states, and every one of them has turned out bad. That's because communism is basically an unworkable system. See, for instance, Hayek's argument on information and economic decision-making. In fact, Marx claimed that capitalism in advanced economies has contradictions that would eventually lead to its being overthrown by the workers, but that has ne…
All of those have been Leninism or its descendants, which break strongly from Marxism. Starting with the required starting conditions.
> In fact, Marx claimed that capitalism in advanced economies has contradictions that would eventually lead to its being overthrown by the workers, but that has never happened.
It's happened in basically all of the countries that were capitalist at the time, where capitalism (that is, the 19th century system that Marx was pointing to) has been overthrown (largely, through democratic means) due to opposition from the working class and replaced with the modern mixed economy which retains some of the basic structures of capitalism, but many features of socialism applied to directly to mitigate the effects of capitalism which can critics from the time the system was named have targeted. (Many of those sytems even call themselves socialist, and the rest of them are labelled that way by their capitalist critics.)