The absurd support of Trumpism need not go as far as Germany's final solution and Holocaust. But it could. The pendulum of societal norms can get small incremental pushes from victimization and hate politics.
Given enough pushes the pendulum can go so far right that it goes up and all the way around full circle.

Decency and goodness are not automatic safeguards to stop the pendulum from spinning all the way around. Decency is fragile. Goodness and love are an aroma while hate is incendiary. In this time when three major religions are preaching self-reflection, and that God's love is supremely powerful, they are only hopes of faith.
Daily good deeds and condemnation of evil are both required to create change.