Would YOU negotiate with someone while they were shoving shit in your face? Especially when he really doesn't need to, because the Palestinians today, for the first time, have a viable alternative at the international level. UN recognition of a unilaterally declared state is not controlled by the U.S. - nor are the efforts of individual nations to pressure Israel's recognition of it. The U.S. can veto UNSC sanctions against Israel, but it has no control over the collective pressure that can be applied by the international community. And THAT is something that is growing increasingly more imminent almost by the day.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Abbas: No peace talks without East Jerusalem construction freeze