One of the greatest screwups in history can be found in the tale of Russia. A small elite ruled over an unwieldy mass, who then rose up and overthrew the elite when, lacking competition, they degenerated into useless people. The masses, being useless and prone to making the wrong decision every time, then murdered the quality aristocrats and intellectuals along with the misguided, misinformed and degenerate. Consequently, Russia downbred itself to the point where its citizens were basically idiots, and Communism seemed like a good idea to them since, being idiots, none of them had anything and therefore they were willing to believe that killing and taking from the better people among them would somehow make them all comfortable.
Seventy-two years later they found out the truth. The society of those who could not manage the affairs of a peasant without becoming unstable and starving, instead of being a kingdom of equality, became a giant kleptocracy where the most vicious predators ruled while assuring the peasants that the future would be better. Adhering to dogma, and vigorously repeating it, became the qualifier for succeeding, and as this was linear and did not measure the quality of people or their DNA, idiots soon ruled and ran the country into the ground. As the Russian peasants had murdered those with the intelligence and willpower to actually restore the country to European status, it became and remains a destitute, ignorant, Eurasian toilet of third world proportions. Russia has utterly failed as a society.