The problem is that both parties have convinced enough of the American people that there are two sides. In campaigning there are usually two pretty clearly different sides... but in actual governance? Not much changes over time that isn't agreeable to both sides.
Democrats don't solidify the things they say they will in order to secure votes. They often don't even try. Republicans deceive their supporters too, but unlike the Democrats they do seem to move the needle backwards well enough. As in... the Democrats have a hard time advancing equality and protections for oppressed peoples, but the Republicans seem to have an easy time rolling back regulations and increasing oppression. This despite most polling indicating more people agree on wanting more freedoms, less oppression, and less corporation rule.
Are there good Democrats? Sure. It's just they are outnumbered by the ones who are focused on themselves rather than the American people. Same goes for Republicans. There are actually some good conservative policies that people like, but those are usually not the ones pushed. Like fiscal responsibility. Republicans run on that all the time, and they talk about cutting wasteful government spending... but then in power, they spend more than Democrats often and waste a lot of spending, run up the deficit, etc. But the advertised fiscal responsibility is good, they just don't do it.
As for Epstein... Trump is either in the list OR can use the list to get leverage from others for things he wants. Trump would love to skewer Democrats on the list, but it will be hard for him to do so without risking losing his leverage or being outed himself... so he and Republicans are motivated to protect themselves more than they are to out Democrats. Democrats have the same problem... Biden wasn't in the list, I'd be surprised if he was anyway, but he surely knows people that are and his people aren't saying boo about it because either he wants to protect friends or wants to use as leverage similar to Trump. That is, unfortunately, how politics work.
Democrats are more apt to throw one of their own under the bus symbolically than Republicans are... Republicans tend to ride or die more often. Then again, Trump does like to fire his own "best people" and then claim retroactively how horrible they were...
Neither party really addresses poverty, healthcare, immigration, the budget deficit, or you name it... term after term after term... the machine keeps rolling along with sometimes token policies as feel-good press to maintain the illusion they are doing something.
You can bank that nobody who is a major player in Democrat or Republican parties is going to have any part in releasing the Epstein information fully. The only way that info gets out is if someone hacks and steals and leaks the info OR someone who really really cares about justice is willing to kill their own career by coming forward with information.