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No doubt that socialism gave birth to some great ideas and great institutions. There's also no doubt that capitalism has enabled huge advances in living standards across the world in the last 150 years. Not many today would argue for either completely unrestrained free market capitalism or for wholly state controlled socialism. Praising the Scandinavian countries just reinforces that point really because social democracy =/= socialism. It has been a success story there but then a bigger focus on free market capitalism has been a success story for a country like Switzerland.

Also put two socialists in a room and the chances are they will disagree. A Marxist would have a very different idea of socialism to someone like Francois Hollande or even Jeremy Corbyn.