There is a lot of suffering, and humans are complicit. A person with conscience finds this disturbing. In some non-theist culture, this is considered just a part of the world being machine like, like a meat grinder. In theist culture, karma is considered justice rather than impersonal mechanics. But it is rather silly, the delayed justice idea, whether it is karma or some divine court. People should focus on the here and now, to make things better, and not just complain about how bad things are, or expect magic to take care of things.