Could it be that they keep it to themselves because to a lot of pee brains like Kerry and the defeatist Dems, Osama Bin Laden is the war on terror. If he's dead, WTC case closed. No need to fight on. Bring all the troops home now. After all the only reason they are in Afghanistan is to find UBL (sarcasm).
*If* Kerry were elected, you may rest assured, as soon as he was briefed in his new capacity, he would probably spill the beans and further condemn President Bush for not telling it.