As frustrating as it is to see, and despite my overwhelming desire to scream "duh" and " I told you so"; The only path out of this division is to try to be gracious and welcoming when someone wants to come back to reason. So please don't fight the folks that are trying to agree with you in a way that saves them their wounded pride. Go watch Behind the Curve to see how these echo chambers make it socially toxic to change your mind, which means people get "trapped" by the fear of judgement, so they just stay in the cult.

https://en.wikipedia.org/wiki/Behind_the_Curve