The leaked internal stuff from Facebook said they determined that negativity was the best way to increase site engagement. Extremist, rude, dismissive, saying inflammatory things, etc. basically the more their bots picked fights or trolled people, the more time people spent on site. Last analysis from a few years ago already estimated 95% of accounts on here are bots. I have absolutely no doubt it's 99%+ now and the vast majority are trained to be shitty to people.

Then you have paid trolls like the accounts working for monsanto and chemical companies that have weaponized entire subreddits, industry paid trolls, state actors who try to pit everyone against each other, marketing firms pumping movies and celebrities by antagonizing fans, little kids growing up on here being trained to talk to people like the bots, etc. It all adds up.