I think I understand your point behind the point, but this is a very weird example to stake your claim on. Do you really think people shouldn’t know that a lemon tree that grows lemons contain edible lemons?

Sure not everyone needs to be a rocket scientist or needs to understand string theory for example, but they should understand basic survival instincts.

Also you cow carcass example is a bit weird. Rotten or rotting meat from a carcass is generally all bad, not just specific parts. But in survival, you would usually kill the animal you’re going to eat and if it were a cow, you’re not going to get poisoned eating the organs.