We already find out a lot from the presence of exactly the opposite complaints by the opposite side. This happens on every single divisive topic. Moreover the feelings people have about their perceptions, the language they use to express them and so on, are identical, even when they're claiming opposite things.

This shows that these perceptions are not objective. That's the main point. Why such perceptions routinely arise, and why people are so intensely convinced of them, is an interesting question but a secondary one.

> exactly the opposite complaints by the opposite side > This happens reliably, even universally, on every single divisive topic > the language they use to express them and so on, are identical

I just don't see, or at least recognise, this type of behaviour elsewhere. See a post on guns or free speech and the flames that erupt amongst USAians, they have a very different character to the ones about china.

> This shows that these perceptions are not objective

Inevitably, but that does not in itself eliminate their being actual differences, and these being of a nature different from other flames ie. being backed not by ultranationalistic citizens of some country, but by a concerted centralised interference.

So again, how do we determine this, or disprove it, in an empirical way?