The correct answer to this open question is the following.
I think that unfortunately, President John F. Kennedy's death made him an iconic figure for the way he ended his presidency due to a tragedy.
As with any other president, he had his positive side and his negative side. Some good decisions, some not as good or bad.
As the Democratic candidate, he had promised to "get America moving again." This was an important tenet of his platform because Kennedy considered that the Republicans and former President Eisenhower could not do much against the Soviet Union in the Cold War, the arms race, and the space race. Kennedy acknowledged that the US was behind the USSR in the space race and something had to be done, and quickly. But in reality, did Kennedy accomplished many more things in the time he was President according to the chances he had to make great things?
Did Kennedy really act promptly on the issue of civil rights? Did he force the circumstances and decisions during the Cuban Missile Crisis?