Adding a group that believes eating only the weakest prey is good would be interesting, since modern hunters have exactly that as their job, but we don't kill genetically weak humans for obvious and good reasons.
A fraction that wants to eat the weakest can therefore have the nuance of "naturalism" to "the greater good" to fascism.
Edit: Rousseau natural state and the Leviathan by Hobbes might be interesting to take a look at
Backpegg