no, the 1948 invasion of Israel by the Arab armies wasn't a "defensive war". In fact, the explicit goal of this invasion was the destruction of Israel. As for the Palestinians who were displaced in 1947 (before the Arab armies entered Israel), you seem to forget that it was the Palestinians who started the 1947 civil war in order to prevent the partition of Palestine voted by the UN, and who started to kill Jews in the first place. On Plan Dalet, there is still a controversy around its real intentions. But anyway, had the Arabs decided not to attack Israel in 1947, there would've been no way for Israel to expell anyone. Mahmoud Abbas himself acknowledged that. Finally, you cite Herzl and Jabotinski. But Herzl lived before the 2nd aliya (when the yichuv became socialist and anticolonialist). As for Jabotinski, he has always been a marginal figure in the Zionist movement. By the way, at the UN, when the Zionists justified their claims on Palestine, they actually said that Jewish history and the biblical promises alone, were not enough to justify the establishment of a Jewish state in Palestine. They argued that the homelessness of the Jewish people and the self-determination right of the Jews (which is a universal right) was what really justified the partition of the territory. As I said, you need a good history book!
Syrian rebels threaten to shell government forces if prisoners' demands not met (Reuters)
from the article: Two peoples and the jungle