Simple. They don't have to track or hunt Osama. He is a member of our extended covert government. Look into the Bin Laden corporate portfolio and then compare it against the Bush corporate entities. Don't believe that bullshit about the bin Laden family cutting off Osama, either.
Billy Gates, well, there can only be one tyrant on the block, and he was threatening the biggest of them all, therefore he had to be whacked with a sharp stick.
Course, I hold stock in Reynolds aluminum wrap and ALCOA, so disregard my wild-eyed ramblings entirely.
"Good intentions will always be pleaded for every assumption of authority. It is hardly too strong to say that the Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern well, but they mean to govern. They promise to be good masters, but they mean to be masters." -Daniel Webster