Your key issue was that Castro “jailed political dissidents.” The political dissidents jailed by Castro were supporters of the Batista Regime, who were slavers, fascists, and colinizers working with the United States. The “authoritarian action” you are criticizing was jailing fascists and slavers, this is definitionally implying that you support Castro letting slavers and fascists run free, ergo defending fascism.
Your key issue was that Castro “jailed political dissidents.” The political dissidents jailed by Castro were supporters of the Batista Regime, who were slavers, fascists, and colinizers working with the United States. The “authoritarian action” you are criticizing was jailing fascists and slavers, this is definitionally implying that you support Castro letting slavers and fascists run free, ergo defending fascism.