The commenter does have a point though; there's a lot of low effort high volume spam on the internet that reinforce certain narratives that cause division, on subjects like gender identity, generational differences, favorite TV shows, wokeism, Brexit, classism, racism, etc. There's actors on both sides of those debates, not because they're particularly leaning towards one or the other, but because the division is causing political shifts and internal strife.

This has already led to the EU starting to fall apart - the UK is out of the EU, Hungary and Poland no longer meet the criteria for having backslid into totalitarianism or at the very least, no longer having a division between the legal and executive branches of law. And it's causing lines to be drawn in the US as well, with calls for secession rising. But the US has been an "us vs them" type of "democracy" for a while now, it probably didn't take much to entrench the sides more deeply.

Anyway, that's online discourse, I'm sure it extends to books too, just less obviously.