Members of the Kennedy family havwe publicly condemned Robert F. Kennedy, Jr’s antivaxx advocacy.

This cannot have been easy for them.

Americans have every right to be alarmed about the outbreak of measles in pockets of our country with unusually high rates of unvaccinated citizens, especially children. Right now, officials in 22 states are grappling with a resurgence of the disease, which was declared eliminated in the United States in 2000. With over 700 cases already reported and indications that more outbreaks will occur, 2019 will likely see the most recorded cases of measles in decades. And it’s not just measles. In Maine, health officials in March reported 41 new cases of whooping cough, another disease once thought to be a relic of the past—more than twice as many cases as this time last year.

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These tragic numbers are caused by the growing fear and mistrust of vaccines—amplified by internet doomsayers. Robert F. Kennedy Jr.—Joe and Kathleen’s brother and Maeve’s uncle—is part of this campaign to attack the institutions committed to reducing the tragedy of preventable infectious diseases. He has helped to spread dangerous misinformation over social media and is complicit in sowing distrust of the science behind vaccines.

We love Bobby. He is one of the great champions of the environment. His work to clean up the Hudson River and his tireless advocacy against multinational organizations who have polluted our waterways and endangered families has positively affected the lives of countless Americans. We stand behind him in his ongoing fight to protect our environment. However, on vaccines he is wrong.

And his and others’ work against vaccines is having heartbreaking consequences. The challenge for public health officials right now is that many people are more afraid of the vaccines than the diseases, because they’ve been lucky enough to have never seen the diseases and their devastating impact. But that’s not luck; it’s the result of concerted vaccination efforts over many years. We don’t need measles outbreaks to remind us of the value of vaccination.

Good on them, and bad on RFK, Jr.