Just speculating here... The Russian playbook in 2016 wasn't just to get Trump elected. It was to divide America. Now, we seem to be doing pretty well at that all on our own, but I wonder if some of their work would be to divide online communities, especially one where people from different tribes could talk reasonably with each other. And, reading the article, it seems like this could easily have been an orchestrate…
I find it hard to blame it all on a few paid Russians commenting on twitter or reddit. If a few guys can get paid to completely divide a nation of 300+million through internet comments, either they're the most persuasive people to ever exist, or the divide was already there. It's not even hard just to read some American news and see how literally every single site that covers mainstream events or political topics makes every single thing into an us vs. them situation. There's no escaping it, and it drives clicks, so there's no motivation to stop.
And it's absolutely bizarre how certain parts of the internet are absolutely flooded with hatred for Russians as a whole, with someone always coming in to scream about them. It reminds me of hearing people's ramblings after 9/11, except this time it's primarily "young and informed" individuals.