“A pope that mentions Dorothy Day is a pope that rocks,” tweeted Neera Tanden of the left-leaning Center for American Progress. Tanden might have wished to reel back that praise if she had known that Day, though a prominent pacifist and socialist, was also a fervent opponent of abortion, birth control, Social Security and the sexual revolution.

It’s fitting that Pope Francis should have invoked Dorothy Day among his pantheon of great Americans — she’s a symbol of where leftists always go wrong. This pope is going wrong in the same way. The left’s delusions of “social justice” seem indomitable — impervious to evidence.

The pope lauded Day for “her social activism, her passion for justice and for the cause of the oppressed … inspired by the Gospel, her faith, and the example of the saints.”

Let’s assume that Day’s motives were as pure as Pope Francis described: Does having the right motives excuse everything?

Day’s interpretation of the Gospel led her to oppose the U.S. entry into World War II, which arguably would have led to a world dominated by Nazi Germany, fascist Italy and imperial Japan. How would that have worked out for the poor and the oppressed?

Though her social views were heterodox for a leftist, Day was a supporter of Fidel Castro and found very kind things to say about North Vietnam’s Ho Chi Minh. She visited Leonid Brezhnev in the Kremlin and leant her moral support to other communist regimes despite their persecution of Catholics and others.

Of Castro, Day said, “I am most of all interested in the religious life of the people and so must not be on the side of a regime that favors the extirpation of religion. On the other hand, when that regime is bending all its efforts to make a good life for the people … one cannot help but be in favor of the measures taken.”

According to “The Black Book of Communism,” between 1959 and the late 1990s, more than 100,000 — out of about 10 million — Cubans spent time in the island’s gulag. Between 15,000 and 19,000 were shot. One of the first was a young boy in Che Guevara’s unit who had stolen a little food. As for quality of life, it has declined compared with its neighbors. In 1958, Cuba had one of the highest per capita incomes in the world. Today, as the liberal New Republic describes it:

“The buildings in Havana are literally crumbling, many of them held upright by two-by-fours. Even the cleanest bathrooms are fetid, as if the country’s infrastructural bowels might collectively evacuate at any minute.

“Poverty in Cuba is severe in terms of access to physical commodities, especially in rural areas. Farmers struggle, and many women depend on prostitution to make a living.”

Pope Francis is a man of the world, and the whole world still struggles to shake off a delusion — namely, that leftists who preach redistribution can help the poor.

We know what actually lifts people out of poverty: property rights, the rule of law, and free markets. Not only do those things deliver the fundamentals that people need to keep body and soul together, but they accomplish this feat without a single arrest, persecution or show trial.