You have not yet shown why this is a fun mechanic (disregarding any realism arguments).
You have not shown any sources (Wolfang, I am looking at you) to prove that cannibalism to gain FEPs (or the RL equivalent) were common practice in the period/location of the game setting.
Cannibalism for survival, like in the siege of Leningrad or that LOST, Andes Edition-movie, does not count.
Yes, many people would rather eat a dead human, than dies of starvation, but a huge percentage of those again would first eat their carpets and candles.