The reason was the intent and actions of European Jewish Converts who arrived determined to expel all Arabs from Palestine. See Jabotinsky's Iron Wall,The writings of Theodor Herzl,David Ben Gurion Speeches,The purpose of Plan Dalet and previous actions,The actions of Irgun and Sterngang-Lehi et al. Israel is selectively forgetful.
Italian FM arrives in Iran to promote economic, political ties (Reuters)
from the article: Photos of Palestinian 'martyrs’ on exhibit at Paris museum