Just to toss in a different viewpoint:
From a Biblical standpoint, the borders of Israel extend much further around, than they currently do today: https://en.m.wikipedia.org/wiki/Land_of_Israel#:~:text=A%20slightly%20more%20detailed%20definition,to%20refer%20to%20the%20Euphrates.
That said, if one ascribes to that view, then technically, Israel is defending themselves from basically being wiped off the map, by their enemies who want to see them destroyed .
Why ? Well, biblically speaking, we have to look at the story of Jacob and Esau, https://en.m.wikipedia.org/wiki/Jacob_and_Esau
twin sons of Issac, who was the son of Abraham. Abraham was known as the father of Israel , God's country, and through his lineage, Israel would become a nation and receive the blessing of God. The firstborn son was to carry the lineage blessing and when Jacob and Esau came along , Esau was born first but through some deception by Jacob and "don't give a crap" attitude by Esau, Jacob carried the lineage: https://goodquestionblog.com/2017/11/17/why-didnt-god-give-esau-back-the-blessing-that-jacob-stole/
Nutshell version: it pissed off Esau that he gave away his birthright even though it was through trickery, but he would've squandered it regardless. Jacob became another father in the lineage of Israel and Esau became the father of the Arab nations, and ended up passing down that hatred for his brother, Jacob, through the generations, down to today, where the Arab nations main beef with Israel is that they stole their land <-- see that ? Stole the land, stole the blessing of God, all starting with Jacob and Esau?
So now, I would say that yes, the original birthright was there but Esau forfeited it because of his attitude, so God chose someone else to lead the nation of Israel who would do it the way God wanted it done in order to form the nation.
So that's the backstory behind the wars still going on today between Israel and the Arab nations . If you were a parent and going to leave your house to one of your children, in your will, wouldn't you choose the child who you know will take care of it and not let it fall into disrepair , regardless of the fact that you still love all your children?
Same thing with God-- he chose the one who would take care of his house (land , country) even though he loved them both and one threw a tantrum even though he wouldn't keep up the property.
It's kind of like the Hatfield's and McCoys-- generations of feuding and it's gone on so long that no one even remembers why they're still fighting in the first place other than they've been bred and raised to keep hating the other side because of one ancestral feud.