Palestinians think in a different way that the Israelis. They believe that any conflict is "merely a continuation of their policy by other means." They do not care of the result of the conflict but the impact of the conflict on their policy. Anyway to answer your Qs. 1: There are two reasons to it: (a) This has put Quartet on notice. It has to deliver what it has been constituted and promised to do. Else get lost. In chess terms they now have the "initiative". (b) Strange as it may seem, Abbas may WANT it to fail via a US VETO only. This would produce a paradigm shift towards a ONE STATE solution. USA knows that. 2: There are TWO preconditions. Both from the Quartet position. (a) 1967 and (b) freeze. The fun part is that it are well stated by USA also. So please see 1(a) above. Quartet must deliver that! The STRANGEST BEHAVIOR is that of UNITED STATES. We just do not know what it wants. It seems they are allowing the situation go towards a ONE STATE solution.
ISIS claims responsibility for bombing in Baghdad suburb; death toll hits 21 (Reuters)
from the article: Palestinian official: Mideast Quartet envoy Tony Blair 'useless'