I suspect that in the particular example you gave it's not really about the great-great grandfather's eviction, but rather that's just a personal thing to relate their general grudge and opposition of Israel to.
I suspect that if you were a native American living in shitty conditions in some reservation you would also have harbored much more grudge against these (now ancient) injustices than if you're a white American whose ancestor got killed by Apaches 200 years ago- it's easier to forgive & forget when you are the winner: after all your hypothetical self is now in no way affected by that 200 year-old injustice.
Want to make sure I'm clear on this: I'm not saying that different people don't have a legitimate reason to be upset. If you're living in a former communist state in shitty conditions because the Soviets destroyed your country, sure. If you're living in poverty in some third-world country because your elected leaders like playing the "big man" in politics and killed all your family? Sure.
There are lots of great reasons to be angry about your current conditions _and_ those things that have gone on before. It just doesn't accomplish much. It creates a culture of anger, vengeance, victimhood, and nihilism.
I think the danger here is to confuse the issue and start talking about who really has a right to be upset or what kind of justice is demanded by current conditions. That's a completely different conversation -- one that must happen in all of these cases, but one which happens in a lot more productive manner when people forgive. Take a look at what happened in South Africa, for instance. Not a perfect resolution, but they are not spending the next 100 years in blood feuds either.
I agree that's it a lot less productive than forgiving and forgetting (I wouldn't give South Africa as a positive example but that's a different discussion, perhaps post WW2 western Europe or post cold-war Europe), and a lot of conflicts would have probably been solved by now had it not been so easy a trap to fall into.
However, I'm not sure it's possible to evade that mentality unless you are able to lead at least a minimally comfortable life - or at the very least it become a lot harder the shittier your life gets.
On a more anecdotal level, as an Israeli I remember a great sense of optimism on both sides when I was a teenager in the early/mid 90s - the territories got autonomous rule, a peace treaty was signed with Jordan (2nd one between Israel and a neighboring country since Egypt a decade and a bit before) and it genuinely seemed as if peace is inevitable.
Then at some point stuff started getting bad really fast, each side only "retaliating" to the other sides actions and the vicious cycle continued to this day ("we're not the bad guys, we're just reacting to what the other side just did!").
I do not agree with you, but regardless, the example you gave - South Africa - proves the point of the person you were replying to, i.e. they "won", so it is easier for them to forget. Not to take anything away from the extraordinary sacrifices of the native South Africans, but at the end of the day, they got to rule their land again, while the native Americans - and the Palestinian - never got to.
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.
I'm Polish, and this is very true. People here, especially old one, feel like victims of history, and are holding grudge.
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.
What about when the strategy of the aggressors is explicitly to hold on for long enough that they can use exactly this argument to keep what they've appropriated from their victims?
I'm not sure what your point is, exactly. How does being mad about it help?
If you have some plan to undo the injustice, that's one thing. But if you are suffering for several generations in a futile attempt to undo the injustice, perhaps it's time to give up and pursue some other goals.
Aside: in the case of land disputes, how did the "victims" come about the land in the first place? Even if they were truly the first humans there, does that give them some divine right to it? And what about nomads?
True, the injustices committed against Native Americans are within the lifetime of the current generation. Look at the history of AIM and incidents that occurred in SD and the governments ignoring of current problem with reservations on the Mexican border. Heck, a court settlement on land use fees that didn't get paid (thanks Department of Interior) is just now circulating.
Some cultures still live by the stories of their elders. The education includes all the old stories. Now add a government that tried to destroy all native languages and traditions, move unprepared members to cities (90% suicide rate). Then add a rediscovering of the old history and attempts to pull themselves back up and find what it means to be in this new world. Some tribes did better, some did worse.
I suspect if a culture was based on the passing of stories from the former generation to the new, continuity breakage problems will be large. The USA isn't really that way, but some cultures inside it are. Add to that some of the rhymes we teach kids that made no sense to the parents of the now "properly" schooled children ("Jack and Jill went UP the hill to fetch a pale of water" doesn't inspire confidence you are teaching proper survival skills to a kid).
I suspect that if you were a native American living in shitty conditions in some reservation you would also have harbored much more grudge against these (now ancient) injustices than if you're a white American whose ancestor got killed by Apaches 200 years ago- it's easier to forgive & forget when you are the winner: after all your hypothetical self is now in no way affected by that 200 year-old injustice.