Why rather than Who seems to be a better question..
The text below comes from the linked site..
No United States president since Abraham Lincoln dared to go against the system and create his own money, as many of these so-called elected
presidents were actually only instruments or puppets of the Bankers. That is until President John F. Kennedy came into office.
President Kennedy was not afraid to "buck the system", for he understood how the Federal Reserve System was being used to destroy the United
States. As a just and honorable man, he could not tolerate such a system, for it smelled corruption from A to Z. Certainly he must have known about
the Greenbacks which Abraham Lincoln created when he was in office.
On June 4th, 1963, President Kennedy signed a presidential document, called Executive Order 11110, which further amended Executive order 10289 of
September 19th, 1951. This gave Kennedy, as President of the United States, legal clearance to create his own money to run the country, money that
would belong to the people, an interest and debt-free money. He had printed United States Notes, completely ignoring the Federal Reserve Notes from
the private banks of the Federal Reserve.
Our records show that Kennedy issued $4,292,893,825 of cash money. It was perfectly obvious that Kennedy was out to undermine the Federal Reserve
System of the United States.
But it was only a few months later, in November of 1963, that the world received the shocking news of President Kennedy's assassination. No
reason was given, of course, for anyone wanting to commit such an atrocious crime. But for those who knew anything about money and banking, it did not
take long to put the pieces of the puzzle together. For surely, President Kennedy must have had it in mind to repeal the Federal Reserve Act of 1913,
and return back to the United States Congress the power to create its own money.
It is interesting to note that, only one day after Kennedy's assassination, all the United States notes which Kennedy had issued were called out
of circulation. Was this through an executive order of the newly-installed president, Lyndon B. Johnson? Or was he one of their instruments? At any
rate, all of the money President Kennedy had created was destroyed. And not a word was said to the American people.