As an outside observer, it seems that the two main ideologies are different in this way:
What liberals call "extreme right" is ideologically quite close to "JFK democrats", which shortly succeeed the "kaykaykay democrats". So self labelled conservatives may actually be conservative. The RINO complication is a real one and oddly, it doesn't go away despite the voters not caring much about them. All the corruption and lies are public, but the populous and leadership seem to be too weak or divided to do anything about it. The other side at least bruns some cities when a junkie of the worng color dies of an OD during arrest. Conservatives...have been polishing their guns for centuries and they seem to be convinced that it's been serving them well. "Silly French with their revolutions..." The ideological centrist can be 75% of the populous, but it will be divided enough over the 2 only parties (name 3 other countries run in such fauxmocracy?) to prevent unity in the United Stated.
This conservative/centrist "extreme right" is villified because right sounds bad nowadays, but really they seem pretty low action. When was the last organized effort to beat up gays or people of color, for the sweet hate of it? These people may exist, but they are lonely and far from an active member of the Republicans. The Reps started out as the anti-slavery party anyway, with the first black senators and all. They're pretty bad at reminding voters of that, though. In most dividing social event such as the recent epidemic (no, it wasn't a pand), some individuals were slightly level headed, but they didn't make a real effort to be heard. At the detriment of national health and personal freedoms. Still the US is one of VERY few countries you can travel to without a nice set of arm shots. Except when you walk across the South border, then you're a deity. Not to the Reps per say, but they only complain verbally, softly.
Liberals themselves seem to be quite into restricting liberties of the masses. Ironic? Silencing voices that would be perfectly fine 10 years ago. Banning free speech. And making norms from something really new. Drag queens not only need to exist, they need to perform at maximum gore in front of elementary school (and younger) pupils. You seem them usually in the crowd with only female teachers and parents. Also, BLM is the law and they have been very outspoken anti fatherfood. Can't have fathers get involved in black youth's upbringing, because reasons.
White males are all that's evil in the world, except when they are in a ped0 crime family and sending silly amounts to extreme nationalists far far away, and funding preteen gender fixes, all kids that can be recruited. Kids can not decide on their school without their parents, and be a decade away from their first legal sip of Bud Light but they can "decide" on a gender swap. On can walk the woke path, but any misunderstood word will END you as a person, nothing will ever suffice, they will always demand more. Kneeling won't do. Kissing feet wond't do. paying reparation to blacks (eff Natives, apparently?) won't do, selling your kids' happiness for gender swaps won't do. And you won't be told what will be the norm to adhere to tomorrow.
A lot of the Democrat noise seems to come from a small group that doesn't care about truth or consistency, only about being heard and presenting some sort of moral high ground, at least for the day. Tomorrow that won't be important anymore, because progress.
I see top politicians leaving the Dem camp because they can no longer identify with the activist that set the narrative. Several have switched over to the Rep side. Not because they want to pray to Trump, but because the ideologies are a lot less grim than they're made out to be in the media. If you're not a Liberal, you're supposed to the next H!tler now. While the actual next H!tler is sent hundreds of billions, because war is good.
A lot of the division can appear to be by design. Do the two parties want this? Well the two party system has been serving them really well. Always great bribes to go around. The way the US does "campaign funding" is considered treason in about 200+ countries in the world. By far most. And it's hard to find an actual ideologist that doesn't take corporate money.
The recent stronger polarisation seems to greatly help in making the pupupous ignor the sell out to China and the losing of all wars self started abroad, despite the trillions invested in "national defense".
Billionaires are a bit too powerful a voice and influence. Most are supporting the establishment and Democrats and Elon Musk was recently sent to the conservative side, his work on the liberal side was done. Digital banking, electric cars, chip implants and taking jobs with robots. Yeah, he did really well there. Now pretend to be a free speech tzar. But keep Assange out of the news, obviously, best be forgotten. Don't ask why.