From the memorial in Portland:

Twenty-five million civilians perished in Europe during World War II. Almost six million Jews – and millions of others – fell victim to racial hatred and premeditated murder carried out by Nazi Germany and its collaborators. Such crimes spring from the darkest recesses of the human spirit. They require planning, collusion, and massive public indifference. Long before Polish Jews were herded into ghettoes, before Dutch Jews were forced into hiding only to be betrayed by neighbors, and before entire Jewish communities in Hungary were transported to death camps. The seeds of the holocaust had taken root

Indifference is what enables fascism to exist