It is not the job of the party to appeal to the people. But the job of the people to subjugate themselves to the party.

I wonder what would happen if Harris wanted to win against Trump more than she wanted to support genocide?

That is their entire point. Two party system means that they can take up all space for opposition to Republicans while making their policies bipartisan.

The Democratic party is entirely built to fight any leftward movement, it isn’t just that the progressives didn’t try. They have been trying for 80 years. It is that the entire party is structured and designed to fight that. That is the actual reason Trump could come from the outside and completely reshape the Republicans, but the Dems can form rank and resist Bernie and the progressives.

The Democrats have shown overwhelmingly and repeatedly that they would rather lose to Republicans than move at all to the left.