Unfortunately using that logic they have to keep doing it. They made huge concessions to get the Oslo accords. They offered more than what could be expected to get an accord with Arafat. Two years from now you will be saying the same thing when they make new huge concessions. If it works the first time Gaza would not have been necessary they would still be living on the credit from Oslo or Camp David.
Now the world knows
Although of course these perpetual victims now point at Israeli control of the borders for all their failures ... a whining that is becoming a bit shrill.