Easy one. The politicians (particularly conservative Repubs: "Godless Communism, you know!, but Dems. as well) suck up to the Cuban Exile community for the sake of a few votes. Notwithstanding the exhile community are the descendants of and heirs to the folks running the cesspool, above.

Thus are the interests of the U.S. (which, by the way, in crass coonservative Republican sell-the-workers-out-to the Corporations style, could make a fortune trading with Cuba) subverted to garner votes & win elections. Q.E.D.