I would have to guess that the correct description of revolution is where the people are not getting what the need or deserve so the people revolt toward the government, possibly overthrowing it, and create the government with its wants and needs. The outcome is the creation of the new government or monarchy with what the people want.
According to the Warren Commission, the group responsible for investigating the assassination, he acted alone.
However, conspiracy theories still abound and a sizeable percent of the population does not believe he acted alone. Most of the Warren report has been released and in 2017 missing information that was withheld for national security reasons is to be released.
