[TeMPOraL]

Rule #1: don't visit /r/all.

Also, you say you're interested in what's popular. And this is exactly the source of your problem. What's generally popular is what appeals to the widest audience in general population. And that is exactly what you see - "political hate, creepypasta and violence". It's the same in YouTube comments, it's the same in all general-purpose discussion boards. Lowest common denominator.

If you seek sanity, you have to start frequenting domain-specific boards, especially those with actual moderation. Be it Hacker News, topical subreddits, or communities around particular bloggers. People there are still regular human beings, but community focus does wonders to the quality of discourse.

Is all of that sad? Yes. Welcome to the human fucking race.