I think you're combining an itemized list of topics with pure tribalism.
As you and everyone here knows, there is no straight right or left when it comes to the multitude of issues. A person can be extreme left on one issue, center on another and far right on another.
Tribalism is where we tend to get stuck in with our discussions.
Basically it's the refusal to call out our team's bullshit when it needs to be called out.
Take McMurtry, in my opinion he's currently very solidly republican. Add to it he can't stand the current democratic culture. I get it. However, he calls out his party's bullshit, which I think makes him a great political poster because I know his intent isn't 100% defending the tribe at all costs.
I believe it's both the ability to effectively communicate our tribes POV while also being able to identify and call out our tribe's bullshit (and/or recognize the blind spots of our personal biases) that make the best contributors on this board.