Even in democracies, we're forced to do what our govt tells us to do, or not do. Soft drugs and alcohol are the perfect example of someone's opinion forced down our throats. the fact that some drugs are harness but illegal while others are harmful but legal.
Americans couldn't travel to Cuba. During the cold war, USSR. Americans couldn't freely express socialist ideas never mind communist ones. This in a democracy. I don't really see a big difference. The peculiarities of Cuba can be understood in its geopolitical context.