The answer to that question is very simple: Cuba's accomplishments are based on social responsibility, a concept that extremist capitalists can never understand. To an ideological capitalist everything has to be geared to eternal greed and to the eternal pursuit of obtaining higher and higher amounts of capital.
Capitalists can never help a human. Helping a person is anathema to them. That is the reason that capitalism is increasingly disliked by a higher number of people throughout the world.
When Jesus said 'Love One Another' that was a socialist principle and not a capitalist one.