If we want political parties and not sects...

[Soph0571]

Tom Watson on the State of the Labour Party...

He counters by asking if I would have preferred him to stay quiet and betray his principles. “I was trying to stand up for pluralism. The Labour party only wins elections when it’s the broadest of churches. But there are some sections around Jeremy and the Unite group that live in a binary world of left and right, good and evil, us and them, in and out. You can’t run a two-party system without nuance and complexity, pluralism and respect for difference. Because ultimately you end up becoming a sect not a party.”

https://www.theguardian.com/politics/2019/dec/28/tom-watson-was-i-disloyal-i-dont-take-kindly-to-being-told-what-to-do]

Emphasis mine
Exactly. This is not just about one party though. One can see the same polarisation and them and us in the Conservative movement and Trump is a master at it. Divide and conquer. Harrumph.