We never really feel we know the full truth about who killed Kennedy.
In 50 or 100 years, we may find the proof that Russia did change some of the voting machines in 2016, just the way Trump is accusing Biden of doing it in 2020. Trump always projected his deeds on to others.
Also, Trump began telling everyone the 2020 vote was rigged because the Russians couldn't change the votes on mail-in ballots, so Trump lost. He possibly lost by a much wider margin, especially in the swing states.
How's that for a left-wing conspiracy theory. The facts of Trump's win in 2016 just don't add up.