Presumably because they are more of a pain to Israel. From the Pew Global Attitudes Project, these and other nuggets.

• Palestinian president Mahmoud Abbas is losing popularity at home and abroad.
• Even before their disputed elections last year, both Afghanistan President Hamid Karzai and Iranian President Mahmoud Ahmadinejad were generally unpopular.  Ahmadinejad’s highest ratings are in the Palestinian territories (45% confidence) and Indonesia (43%), although even among these publics fewer than half express a positive view of his leadership.
• There is no country in which even 40% express confidence in Karzai. In Pakistan (10%), Turkey (7%) and Lebanon (7%) one-in-ten or fewer hold this view of Washington’s favorite Afghan.
• And there’s a couple of pockets of support for Osama.
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