Go straight to Schlesinger’s A Thousand Days: John F. Kennedy in the White House (1965).
He quotes a local: “’the spirit of assassination’ had pervaded the city.” Dallas was inhabited by ‘”people who have hate in their hearts and who seem want to destroy.”
For other sixties-era, “conservative hate killed Kennedy” accounts see here.
Search this book for “hate” and you’ll find other biographers echoing the theme.
This fit with the Liberal Establishment’s psychoanalysis of conservatism: Richard Hofstadter’s Paranoid Style in Politics found paranoid conspiracies under every conservative bed (to steal the phrase about communists under every bed). Yet left-liberals seem to possess their own paranoid style, not that they would ever admit such.
At any rate, here is today’s history lesson:
Oswald did not kill Kennedy, “hate” in Dallas did!