It's interesting to me that we have nothing in Oswald's writings about his views on JFK. Nothing at all that I know of. So why didn't the "conspirators" - the FBI, CIA et cetera - who framed him (allegedly) also plant incriminating comments/statements by Oswald about JFK? Things like he hated JFK, he found JFK a fascist et cetera?
We have some conspiracy advocates who argue all or much of the evidence against Oswald is faked. So, why not have the Paines say he told them JFK was a monster? Or have Marina - who was allegedly coached - to say "Lee hated JFK". Remember, she said Lee liked the Kennedys and they cried together when the Kennedys lost their prematurely born son Patrick. Why not plant writings where Oswald says JFK must be killed?
Most of what we have on Oswald about JFK is that he, Oswald, admired JFK. Or liked him. Or praised his policies on civil rights. This is what DeMohrenschildt said Oswald said about JFK. We have an account by a German geologist, Volkmar Schmidt, who says Oswald told him he detested JFK; and it's this description, in my view, that is closer to his true feelings about JFK. But curiously that's about it.
The conspiracy advocate response will be "They just didn't" or "How do you know how they should have framed him"? Those are pretty weak responses because they would answer the question as to motive.