Do you know that
all of the land that Israel grabbed - except Sinai & southern Lebanon -
are the land under the "British Mandate on Palestine" where the
UN's Partition Plan as a solution for the distribution of the ex British Mandate land which gave some area for "Arab State" were
rejected by Arab nations, then Arab waged war attacking Israel in 1948 and 1976?
Since Arabs rejected the UN Partition Plan, then there was no more ground for Arab to claim the territory except "WAR" which means: the winner take it all. And unfortunately for them the war which waged by Arabs in 1948 and 1967 - with intention to grab all Palestine region (ex British Mandate) - were won by Israel. So Arabs intention to get all Palestine region failed, and Israel grabbed all the region including gaza strip (which was ex British Mandate, that was later on illegally captured by Egypt) and West Bank (ex British Mandate, that was later on illegaly captured by Jordan).
Israel has returned Sinai to Egypt and Southern Lebanon to Lebanon, with compensation of "Peace Agreement" where both countries acknowledge the existence and independence of Israel. It is fair enough, isn't it?
Israel has given the Gaza strip to Egypt/Arab for Palestinian State; isn't it a good intention?
Why should Israel returned West Bank to Jordan? since it should not belong to Jordan legally ? When Israel grab west bank, it was occupied by Jordan illegally.
And why Israel should give all of West Bank to Palestine State? the enemy that never want to acknowledge and has peace with Israel?
Why Israel has to return it to UN, since UN Partition Plan that should be the legal ground (if accepted by both party) had been invalid because rejected by Arab nations?
Israel was the winner over the aggression of Arab nations in 1948 and 1967 war, then logically according to the "Arab's rule (when they tried to attack Israel in order to grab all Palestine region), Israel deserve and should take them all as the winner.
Reference:
https://en.wikipedia.org/wiki/Israeli-occupied_territories
You are right, there is nothing normal in Israel-Palestine relationship, because there is no peace agreement yet; that is because Palestine determination to wage war against Israel. Hamas always portray that it is Israel who hate peace, but in fact Israel desire to construct peace with all Arab nations including Palestine, but they always reject because their desire is to get rid Israel from map.
UN resolution regarding Palestine doesn't mean that UN justify Palestine/Arab claims, UN resolution is regarding the agreement of the UN members regarding the peace/solution way out, it could be viewed as harmful for Israel intention or US politic thats why US vetoed.