Jeesh, so you think the Ruskies, not our Deep State, did it? Sounds like you were a modern-day Democrat before your time.
The main question on the JFK assassination should be: who benefited? The answer is first, Lyndon Johnson, who avoided his removal from the 1964 Democratic ticket and possible indictment in connection with the Billie Sol Estes scandal. Second, the elements in the Federal government that wanted full scale American involvement in Vietnam. Third, the CIA, whose enmity Kennedy had incurred. Fourth, the Mafia, when Robert Kennedy turned against them and JFK refused to provide air support to the Bay of Pigs invasion, thus ending any chance of their return to Cuba.
How would the Soviets benefit from killing Kennedy? I don't see it; Johnson would support escalation against their client state of North Vietnam.