The 2020 primary was a joke too. The Democratic establishment manipulated it with a heavy hand in plain sight of everyone. Even so, their first choice, Kamala, flamed out spectacularly. Yet, somehow, we ended up with her being crowned as the next nominee almost before anyone saw it was happening.
I think it's fair to say that we wouldn't be in this position today if Bernie had won. The "anyone but Bernie" coalition is 100% responsible for the next 4 years.