A federally funded museum is telling Americans not to think. On June 24, the United States Holocaust Memorial Museum instructed the public not to consider the relationship between its subject, other historical events, and the present, implicitly reprimanding Rep. Alexandria Ocasio-Cortez for calling American detention centers “concentration camps.” In doing so, it has made nonsense of the slogan “never again” and provided moral cover for ongoing and oppressive American policies. Comparing the Trump administration’s immigration actions to past atrocities isn’t disrespecting the Holocaust. It’s taking “never again” to heart.