The Castro "Threat"

Here and there, some commentators are starting to speak sensibly about the US' policy and rhetoric towards Cuba. This is from the Christian Science Monitor (via LANR):

...It remains to be seen who the long-term successor to Fidel Castro will be, or what he or she will do, but the US can learn some things from its Cuban experience. Apart from the missile crisis (which was precipitated by the Soviet Union), Cuba has never been a threat to the United States. Rather, as Sen. J. William Fulbright (D) said in arguing with President Kennedy against the 1961 Bay of Pigs invasion, Cuba has been "a thorn in the flesh, not a dagger in the heart." Why, then, have so many presidents, some of them otherwise sensible, been so upset about it? In part, Florida politics; in part, the possible spread of communism; in part the fear that Castro might seek to extend his revolution elsewhere in the Western Hemisphere.

Yet Castro said many times that revolutions cannot be exported. He warned President Salvador Allende, who died trying to bring a similar revolution to Chile, not to pick a fight with the US. His assertions don't match with the US fear that Castro would try to spread his revolution.

A regime change is under way in Cuba. Maybe we would all be better off if there were a policy change in the US as well.