I was going to put up fascinating colour footage of Dachau shot by George Stevens in 1945, but could not bear to do it. This material is just too indecent to show, too painful to watch. “How can one human being do this to another human being?” was his question. The Boy in the Striped Pyjamas is one helpful contemporary take, in a year the focus is on children.
It matters that we remember, because the awful truth is that evil can take root anywhere, any time, given the facts Christians call Fall & Freewill. Political convictions, good intentions, progress, even religion or lack of it, all existed in Central Europe in 1941. They cannot innoculate against evil. Only truthful memory enables us to understand our own moral frailty and, perhaps, make better choices in future.
I can understand lack of belief in God. God does not compel faith, and honest doubt is worth more than feigned belief. I object, however, to lack of belief in evil, including the possibility of anyone being entangled by it, for that really is a pernicious, blinding thing.