I would suggest avoiding some sort of self-inflicted trauma from this horrible past (which might not be happening but it reads like that to me).
There is no point getting depressed from one's ancestors past - if one looks in the past far enough, there will be probably something utterly horrible that given nation/tribe/group did to somebody innocent. Basically all western european democracies fall into this category, and many, many other nations too.
Don't forget about it by any means, tech your kids as I will do, but don't put emotions into this just because your nation was the culprit. There were similar things happening to innocent civilians en masse in the past elsewhere. Genocides are not an invention of Germany or 20th century, life was often pretty horrible and violent in the past.