The U.S. provides nearly half of the aid for global health, including childhood vaccination, H.I.V. treatment and disease surveillance.

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Dr. Mark Hyman, a “functional medicine” proponent and longtime friend of Robert F. Kennedy Jr., is finding powerful allies in his bid to treat disease with blood tests and supplements.

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Readers write about the polio vaccine and the dread of the disease in the past. Also: Reducing crime; the Unabomber’s victims; health insurances woes.

Once, eating whole foods and avoiding toxins was associated with a lefty worldview. Now, being a “crunchy mom” is more often about “health freedom.”

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Readers worry that “our lives are at stake” if he becomes health secretary but also find areas of agreement. Also: Unity, not revenge; criminal justice in New York.

The former president’s most disturbing statements are not bluster. They are a road map to what he will do if elected again.