Why Don't Palestinians Want to Sign a Peace Deal?

Here's a clue:

Part of the answer to that puzzle is supplied from those who, unlike the mainstream media, do pay attention to what is written and broadcast in the official Palestinian media run by Abbas’s PA. Those wondering why the Palestinians would reject peace offers including an independent state (as they have three times since 2000), can do no better than to view this PA TV excerpt brought to our attention from Palestinian Media Watch in which two little Palestinian girls are asked to recite a hateful poem that refers to Jews in the following manner:

“Most evil among creations, barbaric monkeys, wretched pigs,” condemned to “humiliation and hardship.”

It also went on to say the following about the Jewish presence in Jerusalem:

Jerusalem vomits from within it your impurity
Because Jerusalem, you impure ones, is pious, immaculate
And Jerusalem, you who are filth, is clean and pure.

How can you sign a peace deal with "filth"? There's only one way to deal with such "impurity": purge it a.s.a.p. (Are you listening, John?)