Hmm, there's a bit in that which I think I can relate to or somewhat agree with. On the other hand, there's more that I disagree with. I think both parties have more extremists than they used to, and fewer sensible heads. I do not think that the radical elements represent or control either party though.
This I'll have to disagree with: while the Republicans aren't saints and there are a lot of shitty politicians and people in that political alignment (as in "women should be nothing but baby-factories and chained to the stoves" type of nutcases), the Democrats are mostly made up of extremists now. Those who had common-sense or became uneased at how batshit insane their fellows were becoming, ironically, went Republican, become politically neutral in terms of supporting an organized Party or ideology, or even voted Trump, not the Republicans, because he was a populist centrist. Ain't that ironic?
The people left? Most, though not all, are extremists. They're the type of people that literally want America's education system to teach their kids that they're guilty of something for being White, straight, or male.
I think that more damage is done by the fact that the two main parties are so internally united, and represent the only political options. Say, you want to have a gun to defend yourself, but you believe abortion should be legal. You either have to remain silent, or support a group that disagrees with a fairly major part of your political ideology. If you do join up, as far as everyone else is concerned, you are the next identical party clone. There's a whole long list of expectations and assumptions that will be shoe horned onto you, regardless of what you do or say. If you decide that you're not willing to support that group anymore, well be prepared to flip litterally every single opinion and belief 180, or go back to having no voice. And if some new issue ever becomes a hot button? Well, one party will take a stance on it, and then the other party has to take the exact opposite to avoid looking "weak" or whatever.
This I can agree with. If you agree or disagree on certain policies, you're automatically seen as being a political rival or enemy by your own "side". Amusingly enough, the most vitriol of such reactions and disunity comes from the Democrats: "Feminism", feminism, and TERFs come to mind, as examples.
Heck, New York's mayor, who pretty much ordered the deaths of thousands of old people during the Lockdown, is now being turned on by his own Party because it's advantageous of them to do so.
The Left "eating their own" is a meme for a reason -- I think we'll be seeing more of this pattern of behaviour as El Presidente's term carries on, and BLM/AntiFa outlive their usefulness.
All of this made worse by tribalistic idiots, who end up aligned with whichever party for reasons of location or family mostly, but will in some cases literally fight and die, because "My team, right or wrong."
Thing is, it's the Democrats that have escalated this behaviour by "pissing in the pool", so-to-speak. If they hadn't gone full on batshit insane, we'd be seeing far less of this in general -- it's likely American politics would have plodded along as they always did under the "same old, same old" status quot. Heck, Trump probably wouldn't have had a turn in Office.
They are not quite there yet, organisation-wise and violence-wise, but then the internet makes the sort of less hierarchical movements far more viable than they would have been 90 years ago. Though that you have Antifa marching through streets with assault rifles adds another level of concern, as it'll be only a matter of time until these guns will be used to lethal effect on their opponents. Once that genie is out of the bottle...
We're seeing the monkeys dancing to the tune of an unseen organ grinder. I definitely believe there's more coordinated organization behind all these "movements" than just regular people using the internet to organize things, but whether they're part of or make up some sort of conspiracy theory that get people wearing tin foil hats excited is something I have no idea on.
While BLM are racially motivated (with a pair of Communist founders, amusingly enough), a lot of AntiFa's grunts are just dumb kids and adults LARPing (remember "Commander Red"? Haha) that don't realize that their dumbassery is going to have real-life complications/consequences -- even though the people meant to be dealing out the consequences, such as people belonging to the legal/judiciary system, are doing their best to interfere on their behalf because they're useful Cats Paws.
Given what we've seen though, I definitely believe some of those organizational elements are Democrat-aligned or Democrat-funded, though.