Video: What if JFK had lived? It is the 50th anniversary of the assassination of John F Kennedy - a man whose youthful, charismatic presidency defined the early 1960s as an age of hope. Because his life was cut tragically short, we tend to remember only his best qualities and speak of potential unfulfilled. But had JFK lived through the tumultuous 1960s - an age of war and riots - would we speak about him with such unblemished respect? Tim Stanley argues not.