I always wonder why the superstitious should see such a thing as a curse rather than some sort of positive omen. In novels and shows they always have primitive tribes worshipping some unusual animal or trinket but in the real world it seems to go the opposite way.
Obviously they lose out on a goat in the deal and they have to feed this mutant, which is probably useless for normal goat stuff so that's all bad. maybe that's why they see it as "bad" inherently.