President Kennedy was removed after changing his mind on the Cold War. He refused to invade Cuba during the Bay of Pigs debacle, refusing to start nuclear war during the Cuban Missile Crisis (even though his military advisers were demanding it), stopped atmospheric nuclear testing and began the process to withdraw troops from Vietnam.
In his farewell address to the nation, President Eisenhower warned that we should beware the unchecked power of the military-industrial complex. This speech is one of the greatest in American history, and prescient in understanding what was coming. Now, the future that Eisenhower warned about is the content of the daily news.
The removal of Kennedy (and later, of his brother on the threshold of his victory in the Presidential campaign) led to the escalation of the Vietnam war, Watergate, the 1980 "October Surprise," the Iran-Contra scandals, BCCI, the invasion of Panama, Desert Storm (1991 war on Iraq), allowing the 1993 attack on the World Trade Center, Oklahoma City, the stolen election in Florida in 2000, 9/11 and the anthrax attacks on the Democrats and the media, the invasions of Afghanistan and Iraq, and the stolen 2004 Presidential election (to cite a few of the many scandals since 1963).
If our society is going to shift course to use our resources for our survival - instead of military dominance - we will have to convert the military budget toward peaceful purposes. A key part of the understanding needed to shift course is an honest discussion of these events in Dallas - and how those events led to the permanent warfare national security state.
Perhaps the simplest question to understand who perpetrated the assassination of President Kennedy is to ask: Who had the power to change the motorcade route?
(the original route would not have passed next to the Book Depository nor the famous 'grassy knoll')
In the film JFK, the character played by Donald Sutherland (loosely based on Colonel Fletcher Prouty), states:
"That's the real question, isn't it - why? The how and the who is just scenery for the public. Oswald, Ruby, Cuba, the Mafia - keeps them guessing like some sort of parlor game. Prevents them from asking the most important question: Why was Kennedy killed? Who benefited? Who has the power to cover it up?"