Ruminating is not "not trying to get better."
Like how ruminates bring up and chew their cud.
It is literally just reliving things for the sake of itself, not to try to intentionally work through anything.
The hubris to suppose those who ruminate are doing it simply to pass the time...
It's a thing that means only part of the thing (honestly, pretty close to the opposite of the things?). Again, Apparently that's regional and I'm just now learning that.