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Actually there was a study showing hierarchy is naturally harmful
http://www.nature.com/articles/srep18634
whenever you deal with government there's always going to be some better off than others. Supporters rely on the hope that when a government takes over they won't be the ones getting shafted.
Ultimately I don't believe any ideology is perfect, everything has its pros and cons. At the end of the day it's just deciding which pros you want and are willing to sacrifice the cons for.