Again, what’s the justification for killing innocents? Because they walk on land that another claims theirs? That sort of thinking always and everywhere only led to war and war crimes.
As for the Israelis, for those who live there, it’s their home, for many going back three generations. In many cases those ancestors took it it legally under ottoman law. I find that 24-undisputed-hour-rule questionable myself, but your story doesn’t hold up legally in many cases, nor historical. Everyone’s ancestors lived someplace. That doesn’t automatically make that place theirs.
Pointing to an old map and claiming the territory that another currently occupies never leads to peace.