Yeah I used to think that, until I actually started hiding things I didn't want to see. It creeps back in. At one point I wondered about starting my own log of how many times I "unfollowed" or clicked "I don't want to see these kinds of posts." Facebook clearly doesn't do what you want it to sometimes for other reasons. I could hide some people entirely maybe, or put them in a personal group I'd have to visit to see their posts, that would help, but they aren't human beings lost to me that I never want to hear from again.