Firstly, one of the failures of President Kennedy is that he underestimated Cuba and its relationships with Soviet Union. Only when the Missiles were placed in Cuba America's spies noticed that they do exist. America and its leaders nor did expect that Soviet Union could place Missiles in Cuba, nor payed much attention what is happening so close to them. Somehow Americans missed intense ship routs between Soviet Union and Cuba and did not thought that they can hide loads dangerous to whole human kind. The second failure of F.Kennedy was that he provoked the crisis to break out. He was the first one who placed missiles in Turkey near the territory of Soviet Union and by this action threatened to the country. When the Missile Crisis broke out F.Kennedy did not even remembered that America has its powerful weapons near the territory of Soviet Union. Also, Americans were the ones who wanted Fidel Castro and communism elimination from Cuba and by this wish they encouraged Soviet Union to take action. Soviet Union held itself as a country responsible for the spread of communism and America only proved that communism needs to be defended. So for Soviet Union it was a moral and legal justification by placing missiles in Cuba because of America's president's actions earlier.
Secondly, the success of