Go to your thread title, I don't many would for two reasons.Wouldn’t it be that easy? Why can’t the Left show us how/where their way of governance is actually creating better societies?
1) It's near impossible for the Left's ideology and governance to build anything better since it's based on false economics and false belief humans are more altruistic than they are.
2) The Several attempts so far couldn't operate without support, technology, and aid from the West/Capitalists. Either direct through trade or by theft on part of the Left=socialist/communist nations.
A third reason would be that those whom have been taken in by the ideology of the Left aren't the sort whom would succeed at anything on their own, and are motivated by personal greed and an expectation that others should be providing for them.