Please! :) The Castro regime made the decision to seize any land from anyone with 50 acres or more. What sort of outcome did Fidel, Che, and Cienfuegos expect? Well, they expected to build thriving trade economy with the Soviets... whoops!
My point is Marxism/Socialism trades one form of oppression for another. Marxism fails to identify poor leadership as oppressive. Socialist systems are run by error prone leaders that crave power and fortune... They are the same people that run corporations under a different flag. Che was killed trying to overthrow another nation to put in Cuban friendly socialist leadership... How is that different from your banana example?
At least in capitalism we can vote with our dollars. We can spend our money on things we believe in. Not with socialism. Good luck finding choice or innovation that the state doesn't support. It literally crushes innovation.
Besides these arguments, what great things came from Marxism that we enjoy today?