Never underestimate the power of jealousy and the power of envy to destroy. Never underestimate that. Alexander the Great was definitely killed by a conspiracy. Definitely because we know that there were several other people involved. Julius Caesar was killed as such.
Historians sometimes have no concept of the power envy has played in history.
These aren't just mistakes of scholarship. When Kennedy was president, when he was a leader, there was a sea change in the man from '61 to '63. In '63 he was starting to loosen up and really starting to call his own shots. That's when he crossed the line with Cuba and with Vietnam. But there's no question that I'm not alone in my thinking.