Put it this way... Imagine being a poll watcher (side note most lefties are already meat gazers) and seeing what all of these witnesses have seen, but in favor of Trump. Now imagine you try to do your duty to stop it only to get destroyed by MSM and Saturday Night Live... Why does MSM only make fun of certain whistleblowers?
They now believe Trump won.
That's what happens to free thinkers... They get judged by everyone deepthroating MSM, crooked politicians, and hollyweird celebrities.
The difficult hurdle with convincing others is that the only way this could happen is with a massive conspiracy.
Because it requires a coordination of evil on a scale never before seen, and because "conspiracy theorist" is such a common derogatory term, it is psychologically more comforting to assume the person talking to you, presenting you with evidence of a conspiracy is a crackpot, than that what the evidence suggests is true. The obvious conclusion of the evidence is just way too frightening.