However, "bombu" just means an ordinary person having not reached Buddhahood yet, and therefore, in the Age of Mappo, a person incapable of realising Buddhohood by herself. Such a person is indeed blind and ridden with passions and karmic defilements. But this is a statement of fact rather than a moral judgement: even if you have reached one of the Boddhisattva Stages, as long as you are not a Buddha, you are subject to the characteristics of Samsara.
Now, in this respect even a technically omniscient person who would know everything that there is to know about the world would still remain on this side of the Shore. Total ignorance is an obstacle to enlightenment, but total knowledge alone does not amount to enlightenment, which is beyond conceptual understanding.
Even a person that has reached some kind of kensho, a brief glimpse of non-duality or a short experience of the Deathless (especially in situations of extreme emotional stress, e.g. when confronted with death) has still her karmic defilements - i.e. the good or bad effects of actions in her past - to deal with. Such experiences may lead us unto the Buddhist path, but they actually only stress the infinite distance that separate us from a Really Liberated Being.
Thus, one the one hand, knowledge and non-dual experiences do not suffice to ensure enlightenment - they only emphasise the distance to the Ultimate Goal. On the other hand, there is no need either to abandon knowledge, intelligence or insight and to become a callous and unsophisticated moron instead. Truth is, as far as enlightenment is concerned, moron and genius, criminal and saint are on the same par: without Shinjin, they are both destined to hell and with Shinjin they both will become Buddhas on the Moment of Birth.
The Message of the Buddha is: "Remaining as you are, just trust Me". There is no need of change except the Change of Heart effectuated by Amida's Light, resulting in True Entrusting immediately ensuring the Tenth Boddhisattva-Stage now and Perfect Enlightenment in the future.
Neither exalting nor humiliating yourself, just leave everything to the Buddha. Hence also, an obsession with karmic guilt is equally unnecessary. It is sufficient to know oneself as powerless as far as liberation from Samsara is concerned. This consciousness of utter powerlessness, a reflection of the Light of Amida, is the necessary condition for being able to entrust oneself to Amida alone, totally and without any equivocation. This is Shinjin, and Shinjin is Buddha Nature granted by Amida, the Diamondlike Heart conferred by the Tathagata, our Entry Ticket to the Pure Land and Nirvana.
