Just speculating here, but it may be at the request of Mushi. He's not terribly popular in Azzramistan, or Waziristan, whatever it is. A 500lb munition wiping out a village might cause serious problems.
:-} 500 pounders don't wipe out villages but I get your point which is another reasonfro Lehman to keep his mouth shut. There aren't many good options if bin Laden is in the Wild West.