Earlier quoted context omitted.
In my experience, you get out of reddit what you put in. With an account you can unsubscribe from specific subreddits, which I have done to clean up my feed from angry/creepy/violent stuff and I get posts that I am very interested in, primarily from smaller subreddits about hobbies, sports, cool technology, etc.
I have an account, and am unsubscribed from subreddits I do not like. There's no way to visit /r/all without seeing all the political hate, creepypasta, and violence.
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.