"The heart wants such worthy causes to succeed, looking to them hopefully for solutions to our contemporary dilemmas. The head can't turn away from reality. At a certain point, it becomes impossible to resist asking, What is it that makes the noble ideas embodied in these communities so fragile, and so apparently unattractive?"
Akash Kapur in The New Yorker considers recent books on utopian communities.
And Louis Menand thinks about Karl Marx.