There is a saying in the world of computers: "Garbage in, garbage out." That means that if you start by inputting garbage into a computer program, you cannot expect to get anything out except garbage.
Same in the real world. If your initial assumptions are garbage, then your conclusion will be garbage.
Same with the plan to start Israeli-Palestinian negotiations by assuming that there will be a return by Israel to the 1967 lines. This is a garbage-type input, with Israel agreeing to give up all its negotiating chips before the negotiations get underway, and give up the Western Wall, give up the Jewish Quarter of the Old City, give up half its capital city Jerusalem, give up Judea and Samaria, expel 500,000 people for the crime of being Jewish, and withdraw to indefensible borders 9 miles wide. Since Israel will have no negotiating chips for the negotiations if the negotiations start by assuming a return to 1967, there will not be any negotiations. And since the Arab refugee problem is off the table during these attempted negotiations, there will be no progress toward peace. The result will be garbage.
Garbage in, garbage out.
