In an effort to stabilize the Cuban economic and social unrest, Castro created a one-party government to exercise dictatorial control over all aspects of Cuba's economic, political and cultural life. Every political dissent were suppressed ruthlessly. At the same time, he expanded the country's social services, extending them to all classes of society on an equal basis. This made educational and health services available to Cubans free of charge, and every citizen was guaranteed employment.
There would be too much innocents dead, and they feared setting an imperialistic or authoritarian viewpoint for other countries will cause the other countries to unite against them.