Interesting you gloss over the 1956 war, Moses. Why? Are the facts too embarrassing? Where Israel conspired with the UK and France to mount an unprovoked attack on Egypt to provide a casus belli for the Anglo-French invasion to retake the Suez Canal after Nasser nationalised it? A act considered so outrageous that even the Americans couldn't find the stomach to back it and forced the withdrawal of the Anglo-French forces by threatening to call in it's financial loans to the French and the British?
Then we have the truth about the 1967
Six Day war, Moses. As laid out in several books, the Israelis deliberately went out of their way to provoke the Egyptians into closing the Straits of Tiran to provide them with a casus belli. Always remember, the Israelis attacked first in both wars, Moses.
Then we have the 1973 Yom Kippur war. The only one of these wars, apart from 1948 when the Arabs attacked first. They nearly won that one, too, coming within a whisker of doing so. I'm actually thankful they didn't. Their vengeance would have been hot and bloody and would have resulted in unnecessary suffering. Their defeat taught the Egyptians that the only way they were going to recover lost territories was through negotiation and unfortunately, abandoning the Palestinians.
1982, the Israelis invaded and destroyed Lebanon. 1993 and 1996 saw them repeat the exercise. Even the Israeli ex-Prime Minister begin admitted that they were basically unprovoked and were designed more to destroy the PLO than necessarily secure the borders of Israel. In doing so, essentially they created the conditions which created Hizbollah.
Israel made territorial gains which were not, are not recognised by any other nation in all those conflicts. They hold lands belonging to other nations and have made strenuous efforts at ethnic cleansing and colonisation.
I believe Israel's legitimacy is based on UN General Assembly Resolution 181, passed on 29 Novemeber 1947. There was no resolution in May 1948 recognising Israel as an independent state in that month, Moses so the
site where you found that is incorrect. (You really do need to credit where you find information BTW, if you want to have any credibility.) If Israel wants to be considered a legitimate nation it must retreat to the borders Resolution 181 established. Otherwise it cannot claim any form of moral right to it's actions. It needs to withdraw it's colonists from the Occupied Territories and dismantle all the settlements and allow an international commission to adjudicate over the issue of Jerusalem.