Indeed.
This is the most fundamental error in Marxist thought and philosophy. Marx was wrong about this and, as a result, the whole Marxist system falls like a house of cards. It requires perfectible humans. There aren't any.
Imperfect people create an imperfect society, which must then be overthrown by other imperfect people, who create another imperfect society...
It would be a futile exercise, indeed, were it not for the existence of the chosen few, who have already achieved perfection (Obama, of course, comes to mind). These saviors of mankind, due to their unique brilliance and superior consciousness, are perfectly equipped (in their own minds) to lead (or force) the rest of us along the path to utopia. /s