It's difficult for Israelis to trust Abu Mazen after they were deceived by Arafat. Arafat could deliver a peace treaty with Israel and make it work, but in hindsight, he never wanted to. Abu Mazen, otoh, is too weak to do it. It'll take another generation of Palestinian leaders to do it.
U.S. Democratic Sen. Bill Nelson announces support for Iran nuclear deal (Haaretz)
from the article: Here's why Israel must not attack Iran now