It comes down to either you believe that Israel will best survive as a homeland for Jews if it remains an occupying power with the opprobity of most of the world heaped on it and the possibility that it will eventually be subsumed into a single bi-national state through international pressure thus destroying any Jewish majority overnight. Or you believe that it interests are best served through the achievement of a 2-state settlement which removes a valid reason to attack it, provides greater likelihood of it receiving international support in times of trouble rather than being shunned by most of the rest of the world and makes it less likely that it will be pressurised into becoming part of one state with a Palestinian majority. Hanging onto the settlements will not lessen the possibility of war against Israel if its neighbours really want to go down that path. Modern techn ology precludes the validity of having a buffer zone. Even those who support the settlement movement have switched their argument for saying that they are needed for defensive reasons to saying that the land must be retained because it is ordained by G-D!
Jerusalem stabbing: Assailant shot dead after attacking 3 police officers (Haaretz)
from the article: Israel's first step to Mideast peace: Opening the door, Obama style