Excellent comment.
While people on both sides of the field can avoid introspection I do think it is much more of a problem with people on the Left. I try not to argue with those people because they really get their back up. They do not want to consider opposing views. They seem very threatened by the idea.
All I ever try to do is to seem reasonable and to emphasize thinking and questioning. People need to come to their own conclusions, but if they become open to actually thinking about this stuff, it is a major step.
It has been a trenchant and influential observation in my life that one of the hardest things to do is to get people to admit they were wrong and to genuinely change their minds.
Even for me, that is true, but I do try.
On the Left, they discourage that and punish people trying to find the truth.