Soul Society is oppressive, incompetent, genocidal, and arbitrary.
Aizen wants to become god and his soldiers eat people.
Urahara is deceptive, manipulative, running a group of higher than current level warriors with some not-so-heroic character designs, and hired Joseph Mengele.
Oh, and then there are whatever gems of morality live in Hell and the King's Realm. And our protagonist, whose shoulder angels consist of a berserker and his evil twin.