The fact of the matter is they DID. There is no opinion required, its a fact
--------------------------------------------
The fact of the matter is Israel was attacked, after the fact
The fact of the matter is Israel then took lands, following the '67 war, that belonged NOT to the Palestinians, but to messers Egypt, Syria, & Jordan, to better defend themselves from
The "mandate" by this time is long been since null & void, punctuated by the chronology of history and above fact of the UN allowing Jews to return to their homeland, following WWII. As I said originally stated, pity the Arab nations felt compelled to attack Israel