I think the issue is that many people are emotionally invested in not understanding things, in other words you assume people want to understand things. In my experience there is a significant portion of the population who doesn't (and that crosses through all social and political spectra).

IME, it's because a.) it requires one to first admit one doesn't understand something (and hubris prevents this in some people) and b.) learning something requires putting forth the mental effort to understand it. The same reason people don't like reading source code they didn't write: it's hard, and you have to try.

And to a degree and in some contexts (particularly work/in a company), c.) under too much time pressure to take the time to understand. (I.e., too little time is available to them; the dysfunction is higher up the ladder…)

I suspect engaging in bad faith communication goes along with not being too interested in understanding things. These tactics seems to say "Your perspective is unworthy of consideration. I want to ridicule or destroy it."