My bet is that for many (most?), they already have their minds made up (or set in a particularly strong direction) on almost any topic you could present.

Since the curiosity and openness to expand or change one's mind is low, you might as well dive into the dialog and show off / set people straight.

At the same time, I also witness people who really add value to the conversation by providing an insightful framing that I hadn't thought of, provide a synthesis between two people who are speaking past each other, etc.

Whether the trend is one way or the other, I do not know.