In a "me vs you" situation in the context of the relationship, whoever cares about the relationship the least has the most power.
The republican party sees power as the most important goal and are willing to sacrifice the union to get it (US Generals including Milley and Mattis have nearly directly said this and did directly say this in the context of the republican party's king).
Democrats on the other hand are like a desperate ex in denial that the relationship has already ended.
Both parties are at fault. Being a victim does not disavow a responsibility to seek a better outcome. Blame is the opposite of responsibility and democrats are not taking responsibility. Instead, they are blaming republicans, voters, or the law. None of those things are stopping republicans from exerting increasingly more power. Republicans (republican leaders anyway) don't complain about lack of voter support. They create Fox News to manufacture support, or directly attempt a coup. Republcian's don't complain about malfunctioning courts, they load them with ideologues. Republicans don't complain about lack of voters, they gerrymander districts and concoct schemes to make it harder for voters they don't like to vote. They don't complain about a gridlocked congress, they push policy with the courts instead.
Republicans are taking responsibility to achieve the outcomes they want. Democrats are busy jerking themselves with useless result-less blame.
So you can blame republicans if you want, but as a fellow liberal leaning person, you should definitely realize that democrats benefit greatly by not having to step up. They don't want to hold corporations feet to the fire any more than republicans do. They can say they do, but franky I do not believe that democrats want to hold corporations to account any more than republicans do. There are a few progressives like AOC and Bernie who do, but the party as a whole is part of the problem, and I think they are a co-equal part.
Nancy Pelosi got in front of a camera and said "I have a right to participate in the free market." That's the closest thing to a leader for the democratic party saying they have a right to conflicts of interest. The most powerful democrat during the previous presidency said they have a right to be corrupt.
Democrats can say they want to stop congresspersons from trading stock, but they can only say that for the same reason that a couple of republicans are allowed to vote outside of party lines when there are already enough votes. This is just another example of the same behavior.