Trump's scapegoating of Muslims, Hispanics, blacks and other "others" for political gain is exposing a racist ugliness, and dangerously inflaming it. Who knows how big the fire might get? "Never forget" became a Jewish slogan in hopes our collective memory might prevent another Holocaust, but also because we can't forget. It defines us. So as hard as it is to hear Hitler's name all over the news, let it at least remind us why we must stop Trump and all leaders who traffic in racism and xenophobia before such hate defines anyone else.