Isn't this a symptom of a site growing to reflect the broader population? When communities are small, they typically cater to a niche audience, who invites their friends who are directly or tangentially related to that niche.

Once the site grows beyond those 1st, 2nd and 3rd degree connections, you get exposed to those 4th, 5th and 6th degree connections that might have some values and opinions that are shocking to you because they don't run in your orbit.

I feel bad that the author contributes his time to making a world a worse place. I see Reddit as giving more visibility to the world. It's true there's some crazy stuff from some loud people, but my guess is if it was quantified it would still be a small percentage of actual content on Reddit. But just like in life, a rare shocking event dominates our consciousness much more than persistent normal events.