Yes, totally agreed, and I feel this discussion circling straight back to the OP point: Whose job is it to dismantle the machine, and counter the misinformation? It's us; there's no global referee that we can appeal to. How do we do it? Through the political process, because we don't want violence and civil war. Since the winner-take-all voting system mathematically leads to two parties, our agent in the political process is the Democratic Party.

So, it's not the DNC's fault that the misinformation machine exists, but it is their responsibility to fix it, and we can certainly blame them because they're really bad at it.