3) The Palestinians, both officially and according to opinion polls, want the land inside the Green Line, and refuse to end their "irregular militancy" (aka: war but you want to pretend their hands are clean) until they get it. This issue becomes more urgent after Israel withdrew all its forces and civilians unilaterally from Gaza in 2005, with a plan to do the same in the West Bank, and gets in return a militarized statelet that maintains a state of war with Israel. Worse, Hamas, the PLO, and their Western supporters start moving the goalpost of what constitutes "occupation", so that it stops meaning the presence of active military force and starts referring to the simple state of war between neighbors. Then you can keep telling Israel to "end the occupation of Gaza" so that "ending the occupation" becomes solely defined as meeting the demands of Gaza's ruling government.

Now, I'll bite my political bullets and say that I still think the Gaza Withdrawal was the right thing to do, but I also find it totally obvious and sensible that Israeli voters don't want to repeat the experience with the West Bank, which has high ground from which a rocketeer or a sniper can take easy pot-shots at Israeli civilians down below. I can especially see why most voters don't want to repeat the experience, given that even our supposed Western "friends" and "allies" are willing to redefine words so that we somehow become the perpetrators of a crime whose commission is entirely in someone else's control.

To wit, if someone is accused of assault, it is in fact an alibi to have been a hundred miles away when the supposed assault took place. If Israel is accused of "occupation", an alibi becomes a contradiction-in-terms: "occupation" is now when you have no troops on the "occupied" soil but your neighbor keeps up a state of war with you for their own political reasons.