Partly because the smartest people on the other side aren't the ones that the average person on the other side is listening to. They're lost in the noise, even for people on their own side.

For example, when I move, I ask people at my old church if they recommend any churches in the new city. So I naturally end up insulated from any crazy churches that are there. On the other hand, someone who isn't already plugged into the "Christian network" is much more likely to be exposed to the crazy parts of the community.

That's the very mindset that prevents people from listening to other sides.

Instead of focusing on the "misinformation" of those on the other side on a matter (which could even be misinformation on one's own side attributed to the "enemy"), it's best to try to understand their point of view.

Especially on issues where there's no hard and fast right and wrong (as is the case in hard sciences), but are more a matter of moral values, culture, personal experiences, etc.

I don't think it is, and I have a personal example to "prove" my point.

Personally, I'm a pacifist. The average non-pacifist knows nothing about things like middle eastern geopolitics or nuclear weapons policy. If I want to understand these topics better in ways that challenge my pacifism, I should be reading/listening to experts like David Petraeus or John Bolton, not my mom. My mom shares a wordview with Petraeus and Bolton, but she's simply not as educated or influential as these people and so is unable to give me the best arguments to challenge my beliefs.

Now, your mother or some random person X might not be able to eloquently compare the merits of pacifism vs realpolitik, but tons of average persons have good arguments, grounded in reality.

Even more so if those persons are not in some US state that had no contact with war and global politics since forever (aside from some local poor people getting into the army), but e.g. from countries that had actual first hand experience with neighborhood countries, foreign invasions, etc, and have a pragmatic understanding about those things.

Then, for some, you are dealing with an "other side" that represents an existential threat. Do you listen to seemingly-rational statements from someone who, at turns, has suggested it would be better for you or people like you to starve, or be killed, or be thrown in jail? If character speaks to the intention of an act, can an act that seems righteous still be trusted?

Do you see how this can become complicated very quickly?

So many of these conflicts have smoldered for decades and they're now coming to a head. Maybe the US isn't so backwards in its discourse, we might just be the front line of an ugly but inevitable war.