I think a factor with some of them, probably both the ones you mentioned, is that they can't handle criticism. So when they get any push back they double down. Then they get drawn into conservative nonsense that reinforces their beliefs. Then it's a downward spiral as they get radicalized far beyond their original positions.
It's the ones from deep red districts vs the ones who need to work to get re-elected. Looks like the crazies are willing to throw their own people under the bus. Republicans have zero long term strategy.