SOME? If he's omniscient, and did not do everything in his power to avert the problem or at least warn everyone who would be affected, then he's due quite a bit more than 'some.'putting some of the blame on him would be warranted.
Who else COULD be to blame?
The person who rents from an omniscient landlord, stupidly believing he'd lift a finger to save her from a fire he could also have prevented? Silly woman should have installed her own smoke detectors and bought her own fire escape...
Well, what if one of those people tracked mud into the lobby or only nodded politely to the landlord as they passed in the hall instead of taking a moment to stop and ask him about his day? They pretty much deserve to painfully burn to death in those situations and their fate is not wholly in the landlord's hands, but due to their own actions.