“There are a lot of killers,” President Donald Trump said in 2017, defending Russian President Vladimir Putin. “You think our country’s so innocent?” Policymakers used to joke in the 1990s that the U.S. can’t do foreign policy because Republicans think America is too good for the world and Democrats think the world is too good for America. In the 2020s, however, neither Democrats nor Republicans think the U.S. and its allies make good role models. Sadly, we can blame American educators for making it so. At the Dec. 5 congressional hearings on antisemitism, which embarrassed the leaders of Harvard, the...