What if we've gotten into some kind of weird feedback loop where every swing of the pendulum between the two parties has been leading to more and more "extreme"

What if we've gotten into some kind of weird feedback loop where every swing of the pendulum between the two parties has been leading to more and more "extreme" candidates on each side? Or what if the extremism is only on one side, because they perceive the other side as being too extreme, when that side is just trying to be for the people? I'll leave you to decided which side is which, of course...and where all this might lead (it ain't pretty, should this actually be what is playing out).