The horror of the Holocaust is still real. We condemn and laugh at them, but only for surface reasons. We have something that we understand to be evil, but no true understanding of why it is evil beyond atrocity. The Nazis were not evil because they killed millions of people. They killed millions of people because they were evil.
Actions follow intent.
The Europe that existed after World War I did not take this obvious point to heart. Knee-jerk rejection of Nazi policy only comes from a contact with Nazism which, as I have already pointed out, is increasingly rare. There is no true substitute for such experience, but there is a partial solution. We must never think that the attitudes of the Nazis are far from us, and we must realize that we are losing our ability to detect these. Good, as it applies to society, is an extremely subjective term.