It boils down to understanding your own limitatations and weaknesses, or at least keeping in mind that you may have them when evaluating something.
The concept is introspection.
Conservatives possess at least a modicum of introspection, the possibility we could be mistaken or wrong on a given subject.
We have to engage in introspection on a daily basis-large swaths of society today TELL us that we are wrong, bombard us with information telling us we are wrong, and castigating us for being wrong. Conservatives do the right thing by re-evaluating our positions and views to ensure we aren’t going down the wrong road. It doesn’t mean we aren’t ever wrong, it just means we keep in mind we could be. Granted, there are things I don’t have to constantly re-evaluate such as my support for the tenets of the Constitution or the conviction that collective ideologies are destructive and blood stained.
Leftists completely and totally lack introspection.
For Leftists, Dogma rules. Collectivism rules. That drives everything for them. It is not important to be right about an issue, it is important to be in harmony with whatever group they identify with, and everything else is secondary.
...it is important to be in harmony with whatever group they identify with, and everything else is secondary.
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The definition of *in harmony* changes daily, if not hourly. Transgress once and you become suspect. After that, everything is scrutinized for correctness and the poor leftist is soon a non-person, if not an outright enemy.