Some sort of extreme grotesquery should definitly have a place in SG, even rarely encountered; and ever since we already won't have children, I don't see a reason for cannibalism to be not included, hopefully it will be.
Actually grave robbery could be implemented in an interactive way to work together with cannibalism possibly.
Like while bigoted side wouldn't disturbed to witness grave robbery or when themselves doing it for, say loot's sake. And the other more civilized part could see these acts on the quite barbarously side, even both sides wouldn't see each other most of the time.
I really would like to see a big variation of culture of people that take place in SG.
While some may be quite civilized, then some are likely to be too bestial, and those who are in the middle as well, which is to be seen in real life, eventually.
Cultural differences and philosophy which are quite different to each other and their conflicts over others could be felt and made keep alive. This could be reflected to the player so that player is forced to make pipelined decisions within playstyles being unique each time.