(1) They'd like Israel eliminated and for all Palastinain refugees to return to a Greater Palastine. (2) They'd like peace, and independent state and economic development. (3) They'd like Islam to predominate in Greater Palastine. The only way to promote goal (2) is to downplay and ultimately sacrifice goals (1) and (3). The only way to achieve goals (1) and (3) is to downplay and ultimately sacrifice goal (2). Politicians like Abbas and Arafat keep dancing because they really can't reconcile these conflicting goals and the political price (and fear of assasination) would be high if they tried. Hamas, of course, has no problem pursuing goals (1) and (3) and disregarding (2) because they are an authoritarian oligopoly no more responsive to political pressures then your usual tin pot dictatorship. Of course Hamas and the politicians of Fatah have irreconcilable differences. But it is the irreconcilable differences among Palastinians that made them walk away from Camp David and will make it impossible for any of them to sign off on a peace deal with Israel.
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from the article: Fatah-Hamas reconciliation stalls over Palestinian statehood bid