The first zionist Congress in basel was way before the Holocaust so to say colonizing Palestine was a result of it is not true, also the original zionists led by Martin buber were not in favor of colonization rather it was supposed to be a collective of farming communes both Arab and Jewish, the state was supposed to be one bi-national Jewish and Arab state not a Jewish state etc. That all pretty much came out of the British Jewish group i forgot the name right now but there was like a British and Jewish panel that made all the decisions for Palestine under the British mandate.