Michael Bloomberg, the former New York City mayor, launched a lengthy broadside against Robert F. Kennedy Jr., using his opening remarks at a public health conference to warn that installing Mr. Kennedy as health secretary would be “beyond dangerous,” and tantamount to “medical malpractice on a mass scale,” the New York Times reports. Said Bloomberg: “Parents who have been swayed by vaccine skepticism love their children and want to protect them, and we need leaders who will help them do that, not conspiracy theorists who will scare them into decisions that will put their children at risk of disease.”