Sin’s of a father.

Pertaining to world war 2 in which I am now engrossed with, how does a son or a new nation leader make amends for the sin’s of our father or forbears committed? Is it possible to do so at all? The leaders of nations change but the actual heartbeat of the country or territory belongs to it’s people’s. I guess it is possible but I can tell you that wherever you look you will see it’s the people that make the change and not the leader whoever they may be. Leaders tend to thank they are the ones who make the change but they are wrong, it’s the people. They will always take the credit for it, I just hope they are naive about it and not doing it on a conscious level.