Politics has become increasingly hyper-partisan since the 90s [0]. It has become been more about your team vs my team + purity testes and less about politician's policies. As a result, conservative democrats and moderate/progressive republicans of the yesteryear are becoming increasingly rare nowadays.

For example, 13 house republicans voted for the infrastructure bill b'c their constituents will benefit from the bill. Shortly after, Trump and the ultra-right wing members of the house republicans publicly called them traitor, RINOs, and even democrats [1]. Additionally, they've received angry messages and death threats from their constituents b'c one of the house ultra-right wing republican shared their phone numbers on her twitter account.

0. https://www.pewresearch.org/politics/2014/06/12/political-po...

1. https://www.businessinsider.com/republicans-criticize-13-col...

2. https://www.nytimes.com/2021/11/10/us/politics/republicans-b...