Situations In Which It Is Acceptable to Eat Someone.
I. They are dead, through no agency of your own.
II. They are comatose, through no agency of your own.
III. They are in a deepest period of the sleep cycle, through no agency of your own.
IV. They are babies or children without speech.
V. They are looking the other way and not engaging in rational thought.
VI. They are so stupid as to prohibit them being considered an agent.
VII. They demonstrate fuzzy-headed liberal thinking.
VIII. They deserve it.
UPDATE: IX. They are mad.