The world’s richest man is boasting about destroying the United States Agency for International Development, which saves the lives of the world’s poorest children, saying he shoved it “into the wood chipper.”

By my calculations, Elon Musk probably has a net worth greater than that of the poorest billion people on Earth. Just since Donald Trump’s election, Musk’s personal net worth has grown by far more than the entire annual budget of U.S.A.I.D., which in any case accounts for less than 1 percent of the federal budget. It’s callous for gleeful billionaires like Musk and President Trump to cut children off from medicine, but, as President John F. Kennedy pointed out when he proposed the creation of the agency in 1961, it’s also myopic.

Cutting aid, Kennedy noted, “would be disastrous and, in the long run, more expensive.” He added: “Our own security would be endangered and our prosperity imperiled.”

Perhaps that’s why Russia has praised Trump’s move.

In contrast with Kennedy, the Trump administration braids together cruelty, ignorance and shortsightedness, and that combination seems particularly evident in its assault on American humanitarian assistance.

One person has already died of bird flu in the United States, and there is growing concern of a pandemic — yet Trump’s suspension of foreign aid has interrupted bird flu surveillance in 49 countries, according to the Global Health Council, a U.S.-based nonprofit.

Remember the American panic over the Ebola outbreak in West Africa in 2014? (Trump was particularly hysterical back then.) In the end, an Ebola pandemic was averted — in part because of U.S.A.I.D.’s work in Guinea, Liberia and Sierra Leone.