orpheus10,
"When JFK was murdered, the future of millions of people was murdered; I dare say, the future of generations of people was murdered, and the killer knew that."
It's pretty well documented that the Kennedy's were aware of the various hidden dangers they were confronting with their brave approach to political life.
JFK even joked about it.
Their murders effectively served as a warning for any future presidential do-gooders not to rock the boat too much.
And so far no one has.