Well, my objection to crab's legs isn't necessary the fishy nature of the food, but more so towards the primitives wasting food while so many in the world go hungry.
I have no criticism to offer decent and civilized people who dine on crab's legs; if anyone here were a houseguest of mine, and wished crab's legs, I'd happily supply them. Decent and civilized people do not wear "virtue" on their sleeves.
The primitives on the other hand make a big deal out of being "socially conscious" and "caring" towards those who have less. And so the primitives have to be judged by a higher standard, a higher standard the primitives themselves have set.
By dining only on the crab's legs, the primitives betray two hypocrisies: (a) the primitives are happy dining on fine cuisine while much of the rest of the world has to dine on whatever it can scavenge, and (b) the primitives do not feel badly about wasting 90% of the available food, eating only the legs and not the rest of the crab.
It's sort of like what happened to the bison of the Great Plains during the 1880s and 1890s, giant magnificent beasts slaughtered simply for their heart or liver, the rest of them going to decay and rot.
Is it possible to be more hypocritical than a primitive on Skins's island?
I wonder.