Whenever people are doing too well they invent hardships for themselves. No one who is struggled find food will come up with random rules about should and shouldn't be eaten.
Another way of saying "inventing hardships" is "raising the bar". People who struggle to find food might do all kinds of horrible things in order to survive - for example at the expense of other humans competing for the same food. When it becomes easier to source food, they can raise their moral standards. Do you think that's some kind of fallacy? That the standard should be the same, no matter how hard it is to source food (or, in the context of this discussion, alternative foods)?
