What Bernie and AOC are begging of you is not to make the right move, but just to make a move. Get off your ass and run for office, any office, school board, city council, county board, local transit authority, state assembly member, Congress, fucking anything. You don't have to choose the right party, worry about that later, the right choice is to just get out there and start running on your platform. Though they do strongly imply that it would be very, very helpful to primary the centrist, corporate Dems.

It's a sign of corruption and rigging

I never said they do. I just don’t think this is the time to overhaul the whole system when the first priority should be to steady the ship. You can’t fix things if you’re just struggling to stay afloat. Fixing things requires a certain level of stability.

Replacing institutions externally isn’t nearly as easy as rebuilding them internally. A new party in a country where a vast majority votes along traditional family lines is not going to gain any momentum in the time frame that the US needs to correct course. They’re a lot better rebuilding dems internally and keeping the existing external branding. It’s the internet so here’s my uneducated and uninformed opinion: a more progressive offshoot of the Democratic Party external to it only makes sense if the Dems win a few elections on the trot. Otherwise it’s just going to be the same as cutting one’s nose to spite their own face.