You know my soapbox, it is a fine one, define good and evil in your game.
Cannibalism: I can tell you the health reasons why it is a bad thing (mad cow) but I can also show you a number of moments in hstory were it was a good thing (strenght of your foe).
Human Sacrifice: Much the same.
Again I say define good and evil in your games and build your taboos around them, the biggest problem players have with alignment is that they look at them from their view not from a roleplaying view.
Cannibalism: I can tell you the health reasons why it is a bad thing (mad cow) but I can also show you a number of moments in hstory were it was a good thing (strenght of your foe).
Human Sacrifice: Much the same.
Again I say define good and evil in your games and build your taboos around them, the biggest problem players have with alignment is that they look at them from their view not from a roleplaying view.