Why the difference?
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.