And since the Palestinians refused the original partition, why should they be allowed to go back and accept it now? They had their chance, and turned it down.

This is a fallacious argument, beardedbruce. The fact that they refused it means that they are not obligated to accept any borders that Israel wants to impose on them. The fact that they are now saying they will capitulate on the 1967 borders ought to be viewed by Israel as a gift. But Israel doesn't want the Palestinians to have an independent country within any borders, and that is why it is doing everything it can (politically expedient rhetoric notwithstanding) to ethnically cleanse them from all of the lands on which they still live.