Cuba is changing, albeit too slowly. About one-third of its labor force is now in the private sector, and this is just about the only part of the economy that is thriving. I stayed in one of the growing number of Airbnbs in Havana, and people were friendly, even if governments are not: When I said I was from the United States, I inevitably got a big grin and a reference to a cousin in Miami or New York or Cleveland.

Plus, extra credit goes to a country that so lovingly preserves old American cars. I rode in from the airport in a pink 1954 Cadillac.

In another sign of flexibility, Cuba recently hammered out a deal with Major League Baseball that will allow Cuban players to travel legally to the U.S. and play on American teams.

Yet, sadly, the Trump administration is threatening the deal.

Consider the persistence of North Korea and Cuba, and there’s an argument that sanctions and isolation preserve regimes rather than topple them. China teaches us not to be naïve about economic engagement toppling dictators, but on balance tourists and investors would be more of a force for change than a seventh decade of embargo.

Moreover, trade, tourism, travel and investment empower a business community and an independent middle class. These are tools to destabilize a police state and help ordinary Cubans, but we curtail them. America blames the Castros for impoverishing the Cuban people, but we’ve participated in that impoverishment as well.

Cuba’s government is not benign. It’s a dictatorship whose economic mismanagement has hurt its people, and Human Rights Watch says it “routinely relies on arbitrary detention to harass and intimidate critics.” But it doesn’t normally execute them (or dismember them in consulates abroad like our pal Saudi Arabia), and it tolerates some criticism from brave bloggers like Yoani Sánchez.