Blah blah blah blah, okay i get it, you're so biased against the left that you in your flawed logic think that every single one of us lefties is incapable of comprehending context and nuance, a complaint I commonly make about my conservative father, and which you seem to suffer from as well. Additionally you're basically just bitching, at length, about the ever present vocal minority, the Righties have them too, except that they seem to be in control of the GOP now, meanwhile the Dems are lead by centrists, go figure.
Case in point:
The issue is we need more parties. I mean this as for the people.We need a party that is left wing economically but need a party that is right wing for what a lot of people unhelpfully group as "common sense issues" or we will just end up with right wing policies.
This is where you're missing nuance and context yourself, you don't realize that our democracy isn't designed for "more parties", and I put that in quotes because there are already more parties available, but we exist and participate in an adversarial democracy, where it's two parties fighting an ever drifting balance, this was how our founding fathers designed our democracy to work. The nuance in this is also that, for a new party to replace one of the existing primary parties they would have to both achieve a level of popularity and funding.
Now with that said I think we're very close to that happening with the GOP/MAGA Party, if Trump loses they will face a strong possibility of collapse, and if this happens without a civil war I picture a further left party rising and the Democrats shifting back to being the conservative party, like they were prior to the civil rights era and the Southern Strategy.