Because it is part of theplan to prevent resolution. Israel knows the Palestinians cannot accept anything which disenfranchises them and the 6 million refugees (many holding keys to homes in Israel) in camps outside of Occupied Palestine. So, when the Palestinians refuse, as they must, Israel tries to spin it as the Palestinians refusing to negotiate. What Israel is oblivious to, either through ignorance, arrogance, stupidity and paranoia... or a combination of all of them... is that the world, including many Americans who pay for Israel to exist, now know the truth of Israel's foundation and its appalling record as occupier and coloniser. The spin doesn't work anymore. It all just makes Israel look worse. And sadly, it all just puts another nail in the coffin of the Israeli State because, if a Palestinian State is impossible then the only solution will be one state with equal rights for all and it will have a Palestinian majority. You don't need much intelligence to see that such a State will be Palestine, not Israel.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)