I think that if you look at actual battle lines, you will see that Arab troops repeatedly entered into the Israeli territories. If the official standpoint always agreed with what actually happened, we wouldn't be having this debate. And recall that Rabin was assassinated because of his willingness to compromise with the Palestinians. It still seems that Arafat must make the initial overtures, not necessarily out of any moral obligation, but simple recognition of the fact that, while his power base seems fairly stable, Israeli Prime Ministers have very little stability of support.