The thing that most haunted me that day, however...was the...

The thing that most haunted me that day, however...was the fact that these things had - apparently - actually occurred...For all his attention to my historical education, my father had neglected to tell me this: history's terrible moments were real. I understand now, decades later, that he could never have told me. Only history itself can convince you of such a truth. And once you've seen that truth - really seen it - you can't look away.