Far-right leaders are correct that immigration creates problems; what they miss is that they are the primary problem. The greatest threat to liberal democracies does not come from immigrants and refugees but from the backlash against them by those on the inside who are exploiting fear of outsiders to chip away at the values and institutions that make our societies liberal.

Anti-Semitic and xenophobic movements did not disappear from Europe after the liberation of Auschwitz, just as white supremacist groups have lurked beneath the surface of American politics ever since the Emancipation Proclamation. What has changed is that these groups have now been stirred from their slumber by savvy politicians seeking to stoke anger toward immigrants, refugees and racial minorities for their own benefit. Leaders from Donald Trump to France’s Marine Le Pen have validated the worldview of these groups, implicitly or explicitly encouraging them to promote their hateful opinions openly. As a result, ideas that were once marginal have now gone mainstream.