It's not our inability to explain -- it's your inability to understand.
One person reads Morris' answer to the question: "According to your findings, how many acts of Israeli massacre were perpetrated in 1948?" and understands the meaning of "Nakba" -- the other person asks "so what's this about a catastrophe?"
Is Morris some sort of crutch? He's the historian who misinterpreted Ben-Gurion's statement about not expelling Arabs and was forced to debunk his own mistake. This is your icon?
Have you figured out, yet, the specific ways in which Israel has been a catastrophe for Arabs?