Comparing modern fascist movements to the fascist movements of the twenties, for example. The growth of right-wing movements in Europe and America following a steep economic downturn seems fairly ripe, as does the emergence of racial narratives, the use of hateful demagogery, etc.
Trump/Hitler comparisons are fair game, because what is going on bears a strong resemblance to what happened in Nazi Germany.
If we really mean "never again", that means understanding where the Nazis came from, what they are, and who is following in their goose-steps.
By economic downturn, you're talking about the Great War. I mean, there are plenty of people terribly afflicted in the current western world, but it's hard to argue that the scale of the horror even approaches what was lived in those years, for soldiers and civilians alike.
Trump/Hitler comparisons are fair game, because what is going on bears a strong resemblance to what happened in Nazi Germany.
If we really mean "never again", that means understanding where the Nazis came from, what they are, and who is following in their goose-steps.