Answer: After Kennedy's assassination, many world leaders expressed shock and sorrow, some going on television and radio to address their nations. In countries around the world, state premiers and governors and mayors also issued messages expressing shock over the assassination. After JFK’s death, President Johnson told the nation that passing the Civil Rights Act would be the best way to honor Kennedy’s legacy. By July 1964, Johnson and his allies got the act approved. If Kennedy had lived, the debate over the Civil Rights Act would never have occurred during an election year.
The tendency of these people, wherein 10 of them are psychology majors and all of them believing that they will become psychologists, to make predictions about one's life so self-assuredly is called overconfidence.
Being overconfident may have its own pros and cons depending on the situation this behavior used in.