Watergate at 50: Revelations From Newly Declassified Evidence..Secret Agenda: Watergate, Deep Throat and the CIA..documentation he presented has stood the test of time.
"The" CIA was involved in the assassination of one president and because they got away with it, they felt completely secure in removing another a few years later.
They'd do it again decades later.
Forget a republic, this isn't even a "democracy".

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Kennedy was primarily a major obstacle to Israel's plan to acquire atomic weaponry.
And Ben Gurion, Israel's founder and the Jewish state's first leader, who carried out an "ethical cleansing of the Palestinians," tried to persuade him otherwise—Gurion resigned from office on June 15, 1963, something inexplicable to many, and had the utopia that Israel would one day be a United Nations Center and the location of the "Tribunal of Humanity".
Moreover, the president was a hostile figure to bankers and speculators, whose usury leaves many nations in misery because of debts to this day, and to other wicked interests intertwined with them.
We can tell what this service was from the statement of a historian named Martin Sandle. In addition to a former CIA agent and other sources.
The truth is available to all.