Both sides have been equally wronged by the other.
To put it in perspective, imagine if Russia invaded Florida and took half the state. Name ONE AMERICAN who would then post "look at all this land in america, Florida is so small, who cares" but that is exactly how we treat the Israeli-Palestinian conflict.
The hatred continues into the new generations on both sides, but people CHOOSE a side and then insist all the wrongs are on the other. In the same way of my example, Russia owning half of Florida might seek to protect itself against butt hurt Americans who were kicked out of their homes and are angry about it by erecting a wall and dispatching any hostile (American) insurgents.
We can make America or Russia sound like the victim here, and after a few decades they both would be victims of each other. Russia just wants to keep what is theirs, America just wants to be left alone while some radical elements of both are fighting it out and dragging everyone into the mess between them.