I would say it is the overwhelming majority of people’s approach. They have a point of view and are emotionally committed to it. They have this commitment almost equally across opinions even if they only arrived at it by first gut reaction moments ago.
They also project this mode onto their conversation partners. For example, if you offer a counter point or drawback to a proposal, they assume you are strongly opposed to the proposal. Rather than discuss the drawback, they will launch into a stream of defenses of the proposal.
I haven’t found any reliable ways to steer people out of this. The most useful adjustment is to expect it and know that most people are just giving you depth on one intuitively appealing solution.
Simply put most people can’t think straight and therefore can’t converse logically either.