I'm not saying "They should have run Bernie." I'm not a Bernie supporter. They shouldn't have publicly back-stabbed Bernie twice, but...not my issue. Bernie and Biden both represent the same party. The parties despise the voters and have difficulty hiding the fact. To win voters a party merely needs to become less extreme, because each claims it must pull the entire nation in an extreme direction. Each offers voters a giant plate of spaghetti and says "Eat this all in five minutes, or this country will be destroyed." The parties can compromise with voters by changing their platforms to be less extreme. Instead they put up a show like they are fighting each other in order to ignore voters, and big money is in control. Big money is in control of this election. Big money is not going to lose no matter who loses. If Bernie opposes this, Bernie gets tossed. If Trump does, Trump gets tossed. Voters are the fifth wheel in the arrangement.
Many people here seem to believe Trump is an actual threat. He's not. Nobody, not Republicans and not the "Basket of deplorables" would let him have a third term. Its a 2 term system. The Democrats this cycle are focused on scare tactics, because Trump is a perfectly scary figure. It is not any different from last election cycle.