Why US government haven't take Castro down?

-It tried to once- 50 years ago, in the "Bay of Pigs Invasion." THAT turned out to be such an Embarrment for the Kennedy Administration- that they just decided to Wait- until Castro died of more "natural causes..." Well; -They're STILL "waiting..." And Castro is now the Oldest living Communist Dinosaur- on the Planet !! What can I tell You ?! -Sometimes "extinctions" seem to take Forever... :)