Given that Ogres consider themselves 'overmen' (being stronger and tougher does tend to provide evidence for this) their eating of 'lesser men' isn't literally cannibalism. Could it even be that ogres are descended from a rogue group of Brithini who were swayed by chaos? To modern Brithini they might be considered with horror, not because of their chaos taint, but because they impregnate 'animal men' to propagate their race.
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