Huh. [ The Winchesters would fit in nicely in Ukitake's world, he thinks. ] Where I come from, spirits of the dead can stay behind because they have unfinished business -- hang around a bit more with the people or the places they love.
[ Kind of points in Ukitake's general direction as he sits back, as if pointing out a similarity. ] Then we also have those who become violent -- even harmful; because they suffered a violent death, or they want revenge -- corrupted by what has happened to them while they were alive.