Guilt about the past is pointless and silly - it's not as if any of us were about, and we have no more responsibility for what people a couple of centuries ago did than we do for what people did ten thousand years ago. And if you found someone feeling guilty, or angry, because of the things that happened in Ancient Egypt. you'd tell them to lie down and take a rest.

What matters is to learn from the things that have happened in the past, and recognise when things that happen in the present (that we could try to do something about), show a family resemblance to the evils we hope have gone for ever.