Whether one fasts or not, Tisha be'Av should be a time to reflect upon what led up to both the first and the second Destructions. Both were consequences of senseless revolts against the ruling authorities (Babylon and Rome) on the part of an extremist party and an unwillingness to compromise and recognize certain realistic perameters. In each case, extreme nationalism led to destruction, followed by either exile or the demise of the last vestiges of political self-rule. Both followed from an utter lack of tolerance of other views and policies. The rest is history.
PLO official: Reports about Abbas' resignation from political life very premature (Haaretz)
from the article: Anshel Pfeffer / It is wrong to fast on Tisha B'Av