As a child, I had to wash my hands before I was shown books of photographs depicting the ghettos and death camps so that I didn’t leave fingerprints on the pages. This wasn’t a Jewish custom, just the way things were done in our house. Looking back, however, it felt part of the rituals of memorial designed to prevent the atrocities of previous generations from slipping into the sands of time.
The Jews – the only people to have been persecuted in every........