Admitting it will not do a damn thing about the reason it's broken and that's that the greed that drives more money into the wealthiest people's accounts at the expense of the rest of the country will never be stopped. ever. Liberal, Conservative, whatever. The REAL money in this country owns the rest of it and the politicians aren't elected, they're hired to make policies and regulate/deregulate in their favor, not ours. Not our benefit.They can't, though, can they?
If liberals admit that the system isn't working for most Americans they have to shift the messaging of the entire party. Either they shift right and basically co-sign the fascist narrative of the GOP or they shift left and tacitly concede that the left flank of the party that they've been hostile to for the past 8 years was right all along.
You can't do that and still make the case that you deserve to be running the party instead of handing the keys to said left flank.
That's why Trump won. Billionaires bought that election. Trump will do everything he can to put more money in their pockets, whether he does it by design or not. He's too fucking stupid to NOT do that.