In Syria, a no-fly zone targeted at Assad's air force and safe zones for refugees fleeing the fighting would help tamp down the death toll that plays into the hands of ISIS and other Sunni militants who can position themselves as the only groups that are really defending the Sunni population.
Common sense would tell you that the idea that Saudi Arabia was paying for bin Laden's expenses while he was living in Abbottabad is simply risible. Bin Laden's principal goal was the overthrow of the Saudi royal family as a result of which his Saudi citizenship was revoked as far back as 1994.
Osama bin Laden fervently hoped that attacking the United States would create pressure on American leaders to reduce their support for Middle Eastern regimes. Bin Laden believed that without that American support, the Arab regimes would collapse and would be replaced by Taliban-style rulers.
When news of the first plane's hitting the World Trade Center reached them, bin Laden's followers exploded with joy. But shrewder members of al-Qaeda and the Taliban leadership in Afghanistan realized that the attacks might not be the stunning victory that bin Laden, and many in the West, took them to be.