PS this is separate from the issue of whether the land belongs to native americans, native africans, or palestinians, I just mean that getting what you were demanding to be yours makes it easier to forgive previous wrongs.
Young people just go on, catching the chances we eventually have, not thinking too much about history. For the generations that had bad luck to live under German or Soviet occupation during WW2, and then in communism, they still holds grudge (and I understand them).
We even have great poetry about this:
Czesław Miłosz "The Envoy of Mr. Cogito"
"...and do not forgive truly it is not in your power
to forgive in the name of those betrayed at dawn
beware however of unnecessary pride ..."
It's easy to forgive, when you're the winner. For people that had to live as victims for long time, when they see nobody cares anymore, it's hard.
This subject is currently highly dividing point of public debat here - two greatests parlament parties are defining their difference using this division.