It’s not often that President Trump’s Twitter account does more good than harm. He’s a hammer in constant search of a nail, and now that he’s the leader of the free world, his tweets often make him look petty, punching down at private citizens from the bully pulpit of the White House.

But there’s one group of people he ought to name and shame into submission every day until a public health crisis sweeping the nation comes to a grinding halt: anti-vaccine advocates.